1880.] NATURAL SCIENCES OF PHILADELPHIA. 41 



1. D. Sandiegensis, Cooper. Plate V, fig. 3-9. 



Doris {Aclinocyclus?) Sandiegensis, Cooper, Proc. of the California 

 Acad, of Nat. Sciences, ii (1862), 1803, p. 204;' iii (18G3); 1868, p. 58. 



Color corporis e brunneo lutescens, annulis nigris maculatus ; vel 

 brunneus. 



Habitat. Oceanum Pacificum orient. (San Diego Bay; Santa Bar- 

 bara ; Sitka Harbor; Puget Sound). 



According to Cooper, numerous specimens of this species were 

 found from November to May among grass on mud flats in San Diego 

 Bay, at or near low water mark ; according to Cooper, it is a very 

 " active " species ; Cooper later obtained two specimens at Santa Bar- 

 bara Island, on rocks at low water. During the expedition to Alaska 

 a specimen was taken by Dall in Sitka Hai'bor, on alg«, in August, 

 1865, at the depth of six fathoms (another in August, 1873, in Puget 

 Sound, by Dr. Kennerly, on algae, at low water). 



Through the kindness of Dall, I have seen the original (rather 

 rough) drawings of this species by Cooper; a colored one represents 

 the back bright chocolate-brown, with six black rings, of which there 

 are two smaller ones between the rhinophoria ; the rhinophoria, the 

 gill and the foot seem bright-yellowish ; one figure shows five, another 

 six branchial leaves. 



The length of the first specimen, sent to me preserved in spirits, 

 was about 22.0 mm., the height reaching 9.0 mm., and the breadth 

 13.0 mm.; the breadth of the foot reached 10.0 mm., the height of 

 the rhinophoria 2.0 mm., the branchial leaves 3.3 mm. The color 

 was uniformly brownish-gray ; nearly symmetrically on each side of 

 the true back was an annular black spot. 



The form of the rather soft body elongate-oval, not much depressed. 

 The head quite concealed between the mantle and the foot; the 

 outer mouth had the form of a vertical slit ; at each side a short 

 finger-shaped tentacle. The margin of the rather large rhinophor- 

 holes rather prominent, crenulate ; the rhinophoria strong, the club 



' " Pale brownish-yellow, with large, annular, brown spots, irregularly 

 scattered, varying from twelve to twenty, or entirely brown. Surface 

 slightly rough ; sometimes a little tuberculated. Dorsal tentacles conical, 

 retractile ; branchiae large, rising in five jiarts, which become tripinnately 

 divided, expanding so as to cover the posterior third of the body like an 

 umbrella. Mouth proboscidiform, with two short lateral tentacles. Length, 

 3^ inches; breadth, 2| inches; height, ^ inch. — Coopeu, 1. c. 

 4 



