1879.] NATURAL SCIENCES OP PHILADELPHIA. 107 



gill composed of (a not large number of) tripinnate leaves. The 

 lip-disk clothed with a simple thick cuticula. The radula with 

 naked rhaehis, the pleurae with numerous hook-shaped uncini. 

 The ventricle is large, free. The penis unarmed. 



The group, so far as yet known, contains but few species. 



1. A. ttiberculata (Cuv.). 



2. A. flammea (A. et H.). 



3. A. montereyensis (Cooper). 



Archidoris Montereyensis (Cooper), Plate XVI. figs. 6, 7. 



Boris Montereyensis, Cooper, on new or rare Moll. inh. the coast of 



Cal.; Proc. Cal. Acad. Sci., ii. p. 204, 1863 ; iii. 1868, p. 58.' 

 Archidoris Montereyensis. Bergh, 1. c. p. 624, Taf. LXVIII. fig. 24. 



Color luteus vel ochraceus, supra maculis nigris sparsis et seri- 

 atis notatus. 



Hab. .Mare Pacificum. (Monterey, Cala. to Sitka, Alaska.) 



Four specimens of this form were collected by Bischoff at low 

 water in Sitka Harbor. Two were small and two much larger, 

 but otherwise similar in every respect. No notes have been re- 

 ceived in regard to the living animal. The specimens were sent 

 me in a dried condition. They were of a yellowish or ochraceous 

 3 7 ellow color with a larger or smaller number of roundish black 

 spots on the back, here and there confluent in irregular large 

 patches on the middle of the back, which were nevertheless indis- 

 tinctly arranged in two series. The specimens measured 18.0- 

 40.0 mm. in length, 1 1-24.0 mm. in breadth, and 5-13.0 mm. high. 

 The width of the rhinophorial orifices in the largest specimen 4.U, 

 and of the branchial aperture 10.0 mm. The back was covered, 

 quite as in the typical species, with large and small rounded 

 tubercles, reaching 1.5 mm. in diameter in the largest individual. 

 The foot was large, exactly as in the typical species ; the tentacles, 

 as far as could be determined, of the usual kind. 



In two of the individuals the gill was expanded, and the num- 

 ber of the branchial leaves 80. 



Through the kindness of Mr. Call I have had the opportunity 



1 "Pale yellowish, with scattered black spots (or entirely brown?); 

 mantle rough, tubercnlate, or nearly smooth ; dorsal tentacles knob-shaped ; 

 branchial rays bipinnate, short, in eight divisions, forming a crown-shaped 

 expansion on the posterior third of the dorsum. Foot expanded into a 

 broad, thin margin as wide as the mantle. Length 3", breadth 1", height 

 |"; form elongated oval. 1 ' Cooper, 1. c. 



