452 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.89 



one specimen in vial in U. S. National Museum material, No. 118/156b, 

 collected in tow off Beaufort, N. C. ; serial sections of posterior half 

 of this specimen. 



Form. — Oval or slightly oboval (see Pearse, 1938, fig. 22) ; size 

 moderate, maximum dimensions 18 mm. long, 5 mm. wide, most speci- 

 mens smaller than this; tentacles absent. Young specimens (fig. 24, 

 a) may be very obovate. 



Eyes. — ^Marginal band of small eyes around anterior half of the 

 body ; cerebral and tentacular eyes in four conspicuous clusters ; tentac- 

 ular clusters compact, of about 10-20 eyes each, some large; cerebral 

 clusters looser, more elongate, of 10-25 smaller eyes, often with one 

 or two eyes considerably in advance of the group; without definite 

 frontal eyes. Young specimens (fig. 24, <z), with about five eyes in 

 each group, marginal band one or two rows wide. 



Color. — Florida specimens gray with faint radiating light streaks ; 

 specimens from North Carolina northward yellowish brown or tan 

 with brown speckles. 



Digestive tract. — Pharynx central, elongate, ruffled with a num- 

 ber of ruffles of moderate length, mouth at rear end of pharynx; 

 digestive branches radiating to periphery, not anastomosed. 



Reproductive system.: — ^Pearse's description and figure partly 

 wrong. Vasa deferentia as in his fig. 22 confluent behind Lang's 

 vesicle, then extending forward and turning back along-side the 

 posterior part of the pharynx to enter male copulatoiy complex. 

 Male antrum large, giving off laterally and anteriorly a semicircle of 

 about seven pockets, each of which contains 1-3 large prostatic organs 

 (prostatoids) (fig. 24, h). Each prostatoid is a pyriform body with 

 a thick muscular wall through which pass the outlets of prostatic 

 glands, discharging by way of the pointed free end of the prostatoid. 

 Posterior pockets and prostatoids largest, size decreasing to anterior 

 one. Penis papilla as in Discocelis (see Lang, 1884, pi. 30, fig. 1), 

 short, truncate, depending from roof of male antrum ; vasa deferentia 

 enter it from in front around the sides of the antrum and unite to 

 a common duct which continues as the penis lumen. Wall of male 

 antrum and of penis papilla with numerous small prostatoids (ade- 

 noids), having a thinner muscular coat than the prostatoids and 

 striated interior. Typical prostatic vesicle and seminal vesicle ab- 

 sent. Common genital pore. Female tract as in Discocelis (Lang, 

 1884, pi. 30, fig. 1). Vagina opens into posterior wall of common 

 genital atrium, expands into cement pouch receiving numerous ce- 

 ment glands, proceeds dorsally, then curves posteriorly and down- 

 wards and after receiving uteri opens into crescentic Lang's vesicle 

 (called by Pearse "pair of transverse accessory uterine organs"). 



Distribution. — Florida northward to Massachusetts, rare in the 

 northern part of the range. 



