114 BULLETIN tiF THE BUREAU OF FISHERIES. 



Genus 1. ASCHISOBIS Bergh. 



Doris, auct. 



Areltidoris Bergh, Malacologisfhe Untersuchungun (Semper, Keisen im Archipel der Philippi'nen, II, Bd. Ill), H. XI\', 

 1878; p. 616, Supplement-Heft I, 1880. }>. 33; H. XVIII, 1892, p. 1092. Nudibranohiate Gasteropod Mollusca of lljc 

 North Pacifie Ocean. I. Proc. Acad. Nat. Sci. Phila., 1879, p. 106. Report on the Niidibranchiata, Challenger 

 Reports, Zoology, X. 1884. p. 84. System der Nudibranchiaten Gasteropoden, p. 100, 1892. Die Opisthobranchi<n 

 (Albatross Expedition), Bull. Mils. Comp. Zool., XXV, 1894, 10, p. 157. 



Body not hard, subdepressed, notfeum granular or tubercular; tentacles short, thick, with external 

 longitudinal sulcus; brancliial plumes not numerous, 3-4 pinnate; the foot wide, its anterior margin 

 superficially sulcate. Labial armature none. Rhachis of radula naked, pleurae multidentate, teeth 

 hooked. Peni.= unarmed. Vagina unarmed. 



1. Archidoris montereyensis (Cooper). 

 [PI. .\xni, fig. 4; pi. XVIII, fig.s. 1-5.] 

 norU monlereyensU Coopero. Proc. Cal. Ac. Sci.. II, 1862, p. 204; III, 1863, p. 158. 



Arrhidnris montereyensis. Bergh, Mai. Unters., H. XIV, 1878, p. 624. Nudibr. Moll. North Pac. Ocean. Proc. Ac. Nat. Sci. 

 Phila., 1879, p. 107. Syst. der Nudibr. Gast., p. 100, 1892.— MacFarland, Preliminary Account of the Dorididit of 

 Monterey Bay, Proc. Biol. Soc. Washington, XVIII, February 2, 1905, p. 37. 



Body elongate, elliptical, but slightly depressed, the ends nearly equally roimded, dorsum some- 

 what arched. Dorsum not hard, everywhere closely set with low conical tubercules, in alcoholic 

 specimens somewhat rounded. The largest of these are about 1 mm. in diameter and between them 

 are smaller ones of varying size. Mantle edge thick, extending everywhere beyond the foot except over 

 the tip of the tail when the animal is crawling. General ground color (pi. xxin, fig. 4) light yellow, 

 having a dusty appearance, due to extremely minute brown, greenish brown, or black dots thickly 

 sprinkled over the dorsum everywhere. Larger patches of the same color are scattered over the dor- 

 sum, principally over the median portion, upon as well as between the tubercules, and more sparingly 

 upon the branchial plumes. In alcohol the yellow color is lost, but the dark blotches turn to a dark 

 blue shade and last for some time. 



Length up to 50 mm., width 25 mm., hei^dit 11' mm. 



Foot smooth, elongate, elliptical, light yellow, the anterior margin bilabiate, the upper lip much 

 thicker and wider than the lower, no median notch. 



Head inconspicuous, mouth small, a vertical slit, the sides continued into the short, blunt, fold-like 

 tentacles which are auriculate with a clearly marked external groove (pi. xviir, fig. 5). Ehinophores 

 stout, retractile into conspicuous sheaths, the margins of which bear irregular tubercules similar tcj 

 those of the general dorsal surface. Stalk conical, the clavus slightly dilated, conical, perfoliate, with 

 24-30 leaves on each side. 



Branchial plumes 7, large, spreading, 3-4 pinnate, yellowish, sprinkled with minute brown or 

 black spots giving them a dusty appearance, occasionally with larger jiatches of the same color. 

 Deeply retractile within a prominent sheath with tuberculate margin. The plumes are arranged in a 

 U-shaped arc around the anal papilla, which is truncately conical and often tipped with the brown or 

 black color of the spots of the dorsum. Renal pore near the base of the anal papilla and slightly in 

 advance on the right side. 



Blood glands small, thin, the anterior one rudimentary, the posterior one behind and in contact 

 with the central nervous system, narrow, ribbon-like, with lobulate margins, about 2 mm. long by 0.5 

 mm. wide. 



Pharyngeal bulb strong, conical, its length about 5 mm.; breadth and height, 4 mm.; the radula 

 sheath projecting behind and below tor about 2 mm. as a rounded process. Lip disk rounded, covered 

 with a thick, colorless cuticle. 



" The very fragmentary description of Cooper is as follows: " Pale yellowish,''with scattered blacli spots {or entirely 

 brown?); mantle rough tuberculate, 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 inches; breadth, 1 inch; height, three-fourths inch; form, elongated oval. 

 Dredged in to 10 fathoms in Monterey Bay, adhering to fragments of sandstone; only 2 obtained in September." The 

 specimens studiei! by Bergh were taken at Sitka. Alaska, and were sent to him in a dried condition. From a study of 

 this material he assigns TK in.onieretjauis to his genus Archidoris and gives general measurements of the body (.shrunken ) 

 and the characteristics of the radula. Further than this no study of the .species has been made. 



