50 MacFarland Preliminary 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 short 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 bluish spots or entirely plain, the tips of the pro 

 cesses of frontal and dorso-lateral margins, tips 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 : 80 mm.; width, 25 mm.; 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 broad 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 heavy blunt cusp sloping gradually forward 

 on inner posterior portion ; pleurae 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 ampulla 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 mm. in diameter, spermatocyst elongate, pear-shaped. 



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

 Macroci/stis, at some distance 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. 181,27-8, 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 



