OPISTHOBRANCHIATE MOLLUSCA FROM MONTEREY BAY. 129 



9. Cliromodoris porterae Coekcrell. 



[fl. XXVI.Hks. U, 14.1 



ChTomoiloris porterx Cookerell, Three new species i.f (•lirimiorlorix, The Xaiitihis, XVI, UtOl, ■>. j.. I'J.— MacFarluiid. op. 

 cit., p. 44. 



In the summer of 1894 a single individual ■>! ' 1ir<i,iin<hii-iy was taken at Light-House Point, and the 

 (■oli>red drawings of plate xxvi (tigs. 13, 14) we:.- ma.lc lr..in it. The animal escaped down the over- 

 tlciw pipe of the aquarium soon after, and no .spciim 'U-j have .since then been found in the vicinity of 

 Monterey Bay. In 1901 Prof. T. D. A. Cockerell described the above species from La JoUa, Cal., 

 where it appears to be quite common, as also at San Pedro. With his kind permission the following 

 description (1. c. ) and analytical table of species of Cliromodoris found by him are here reproduced: 



"Len^rth abiiut 11 mm., form of ''. mnirr.iil'i/is. Init uniformly nnich smaller and quite different 

 in markiiijis. Decji ultramarine blue, inrliiiliii'.; thi- whole of the foot; mantle with two rather broad 

 longitu<linal stripe;^ (if bright orange, nut unitel posteriorly and ending anteriorly at the rhinophores, 

 but anterior to the rhinophores is a transxerse orange stripe; median stripe of C. vtacfmicmdi repre- 

 sented by an inconspicuous, lighter-blue line; margins of mantle very narrowly pure white; foot 

 wholly without marks, except that the hind end has a suffused whitish stripe. Rhinophores and 

 branchiae entirely retractile. Branchial plumes 11, in a circle, simply pinnate, entirely of the blue 

 colcjr of the mantle. After death a number of conical white papillfe (about 9 on each side) appear 

 beneath the hind part of the mantle. After death the blue dissolves out and the body becomes a 

 sort of jiale greenish blue, with the dorsal stripe very white and the orange band.s as in life. 



"Habitat: In rocky pools at low tide, La Jolla, Cal., early in August, rather connnon. ( Wiimatte 

 Porter Cockerell.)" 



Table of species of Chromodoris found at La Jolla. 



.1 iH neral color a deep 'iltrnmarine blue, which after death dissolves out in formalin, or even in .sea water. 



'(. Small, about 11 mm. long, mantle with two orange stripes, foot without orange marks C. porier»: Ckll. 



h. Larger, over 60 mm. long, mantle and foot with numerous orange spots C. vniversUatu Ckll. 



JS. General color purple, very brilliant, the color not dissolving out after death in formalin or sea water. 



(I. JIantle with a yellow margin and three longitudinal yellow stripes; end of foot with an orange stripe. 



C. marfarlamlival. 



The specimen taken at Pacific Grove was 22 mm. in length, twice that of tlie La Jolla specimen.*, 

 but in all other external features agrees with them. 



From my own notes of 1894 I take the following description: 



Body elongate, linear, depressed, mantle about equally rounded in front and behind, mantle 

 margin rather narrow laterally and behind, in front broad; tail not covered by the mantle save in its 

 anterior portion. General body-color deep ultramarine blue; mantle with 2 broad longitudinal stripes 

 of orange, entirely or incompletely united behind the branchial plume, ending in front just outside 

 the bases of the rhinophores; in front of rhinophores a transverse arc of orange as if a continuation 

 of the lateral stripe; a median light lilue line extending from between the rhinophores to the branchia;; 

 margin of mantle narrowly edged with white; foot of same ultramarine blue as rest of body with a 

 suffused median stripe of lighter blue upon dorsal surface of tail. Rhinophores perfoliate with 12 to 

 14 leaves, clavus slightly darker blue than the body of the animal, retractile within low sheaths witli 

 smooth margins. Branchiae 9 to 11, simply pinnate, slightly lighter in color than the mantle, 

 completely retractile within low sheaths with smooth margins. 



Length, 22 mm. Radula? Reproductive system? 



The above, together with the colored figures of plate xxvi, will sufRce for the ready recognition of 

 this species in life. I hope to be able soon to add detailetl anatomical observations upon this and the 

 other species of Californian Chromodoridinw, which may throw some light upon the specific distinc- 

 tions existing between them. Up to the present time there have been listed the following species of 

 this genus from the western coast of North and Central America: 



(1) Chromodoris dalli Bergh, Puget Sound. 



(2) Chromodoris califomiensis Bergh, Santa Barbara Islanrl.s, San Diego, Monterey (Dall). 



(3) Chromodoris imiversitatis Cockerell, San Pedro. La Jolla. 



(4) Chromodoris a(/assizii Bergh, Panama. 



(5) Chromodoris porlera: Cockerell, La Jolla. 



(6) Chro/nodoris macfarlanili Cockerell, La Jolla, San Pedro. 



(7) CAromutfonsaeyiu/m Bergh. Gulf of California. 



