50 MacFarland — PreUminary Account of Dorididse. 



15. Triopha grandis sp. nov. 



Type from Monterey Bay, Calif. No. 181,283, U. S. National Museum. 



Body large, not depressed nor compressed, plump, sloping rapidly back- 

 ward from heart region to tip of sliort blunt tail, more gently forward ; head 

 flattened above with prominent semicircular frontal margin bearing 10 to 

 12 tuberculate or branched processes ; dorso-lateral margin with 4 to 6 

 similar processes; dorsum arched, smooth, of a yellowish brown color 

 flecked everywhere with l>Iuisii spots or entirely plain, the tips of the pro- 

 cesses of frontal and dorso-lateral margins, tii)s of branchiae and tip of tail 

 yellowish-red ; foot linear, rounded in front, tapering to blunt tail behind ; 

 tentacles blunt, auriform, 3 mm. long; rhinophores rather large, perfoliate 

 with about 20 leaves, retractile within conspicuous smooth-margined 

 sheaths ; branchia 5, tri- and quadripinnate, wide spreading. 



Length of largest specimen : SO mm ; width, 25 nun.; height, 30 mm. 



Mandibles elongate triangular, light yellow, much reduced in size, made 

 up of short slender slightly curved rodlets; radula broad, deeply grooved, 

 the teeth deep amber in color; rachis bj-oad with 4 series of flattened 

 plates, the 2 median rows nearly equilaterally rectangular, thickened 

 transversely in anterior half into a cutting ridge from which a fainter longi- 

 tudinal ridge extends toward the anterior margin, the plates of the 2 outer 

 series triangular and bearing a heav}^ Ijlunt cusp sloping gradualh' forward 

 on inner posterior portion; pleurjie 7 or 8 in number, strongly hooked of 

 nearly equal size, with small wing on basal portion of shaft; uncini 8, pris- 

 matic, flattened, the inner 4 of nearly the same size, the outer 4 rapidly 

 decreasing, the outermost being nearly rudimentary, each bearing a low 

 longitudinal wing-like crest projecting toward the median line. Herma- 

 phroditic duct very long, together with its slightly larger amjnilla meas- 

 uring about 60 mm. in an average specimen ; the spermatic duct passes 

 into the large, flattened prostate gland almost at its origin and beyond this 

 gland dilates into the long, cylindro-conical ampulla, 5 mm. in length by 

 2 mm. extreme diameter at proximal end ; glans penis and distal end of 

 vas deferens lined with closely-set minute hooks; spermatotheca very 

 large, 10 nun. in diameter, spermatocyst elongate, pear-shaped. 



This species has been taken only upon the brown kelps, Nereocydis and 

 Marrocj/diK, at some distam-e from shore. It has never been taken in tide- 

 pool collecting where the 2 above described species are common. 



16. Polycera atra sp. nov. 



Type from Monterey Bay, Calif No. 181,278, U. S. National Museum. 



Body limaciform, smooth, plump, highest in cardiac region ; head rather 

 high, sloping in front, expanded into a moderately wide horseshoe-shaped 

 frontal margin bearing 4 long slender processes; at the sides below the 

 rhinophores this frontal veil is slightly dilated and bears 1 or 2 short 

 pointed, angular processes, laterally it is continued into a more or less con- 

 spicuous dorso-lateral ridge highest in the branchial region where it bears 



