Plectus cirratus fm. parietinus subfm. latilaimus Allgén, C. A., n. sf.

Plectus cirratus Bast. f. parietinus Mic. sf. latilaimus n. sf.

Dimensions.--Body-length= 0.721 mm., max. width = 0.0 3 3 mm., o esophagus = 0.1 6 4 mm., tail =0.073 mm., α= 21.85, β =4.40, γ,=9.88.

I n the sample h'om b3 was f o u n d a female of this genus, which seems to be closely related to P. parietinus, to which it is similar in the shape of the head, provided with well=developed lips, the (esophagus h a v i n g a large bulb a n d in the tail, being short, conical, r o u n d e d a t the posterior end, with pointed t i p a n d containing three glands in the anterior half.

Especially characteristic of this form is ~he very spacious buccal cavity (tube), which is twice as long as wide. I t s length is 13.11~ a n d width 6.56~. Also remarkable is the v e r y strongly developed cardia of this new form.

F i n a l l y the lateral organs are s i t u a t e d at the middle of the buccal t u b e a n d consisting of a simple circular sling.