MdcFaild 11(1 — J'k liiiiihdi 1/ Addinil of Dorididse. 53 



I'd. Ancula pacifica ^\>. iiov. 



Tiipr from :\Ionterey Bay, Calif. No. 181, 2S0, U. S. National ^Nl^iseum. 



Body i^li^Hitly compressed, smooth, limaciform, higlie.st in front of bran- 

 chia', tapeiiiijr l)eliiiui to tip of the long pointed tail, in front sloping less 

 rapidly to tlie higli rounded head. General gronnd-eolor clear translucent 

 yellowish-white, a narrow median orange line on dorsum from between 

 rhinophores to tip of tail, interrupted by the branchise; upon the indis- 

 tinctly marked dorso-lateral margins a similar line extending from rhino- 

 phores backward, interrupted by the extra-l)ranchial appendages and 

 jvrolonged for a very short distance beyond the last one. 



Head bluntly rounded, the tentacles slender, short and l)lunt; Rliino- 

 l)hores without sheaths, large, perfoliate, with 9 leaves. At the base of the 

 rhinophore two long slender finger-like processes, tipjied with orange, 

 extending obliquely forward and outward, nearly as long as the whole 

 rhinophore; branchiae 3, bipinnate, in part tripinnate, without sheaths, 

 tippeil with orange; on each side of the branchise on the dorso-lateral 

 margin are borne 4 blunt club-shaped processes dilated above, their distal 

 third light yellow. 



Length of largest individual taken, 16 mm.; width, "J mm.; height, 

 3.0 mm. 



Pharyngeal crop spherical, pi-ominent, connate; labial armature strong, 

 of flattened blunt minutely serrulate hooks; radula narrow, colorless, the 

 teeth in :>3 rows increasing in size from front to back, the posterior teeth 

 being twice the size of the anterior ones ; rhachis narrow, with a single 

 series of flattened quadrangular jilates ; these plates absent in the first 8 to 

 10 rows but constant in the remaining portion ; pleural teeth 2, the inner- 

 most large with irregular base and concave triangular vertical body i)laced 

 slightly obliquely to the median line; its inner margin tiiickened and 

 V»earing 11 to 17 sliarp recurved denticles, and terminating above in a 

 strong hook ; the outer i)leural tooth triangular, thin below and thicker 

 above, terminating in a strong apical hook. Glans penis with about 15 

 rows of exti"emely small hooks. 



Found on hydroids and bryozoa in tide-pools along southern shore of 

 Monterey Bay ; rare. 



Hopkinsia gen. nov. 



Form of body elongate-oval, very much depressed ; the dorsum thickly 

 set with long ))apill8e— simple or occasionally forked ; pallial margin not 

 set ofi" from the sides of the body but sloping gradually down into the 

 foot without any distinct boundary, anteriorly continued into a broad velar 

 expansion formed by the fusion of the labial tentacles in front ; rhino- 

 phores non-retractile, perfoliate; branchipe several, separate, simply pin- 

 nate Illumes arranged in a horseshoe-shaped arc; the foot broad, its margin 

 thin, undulating, in front deeply emarginate, behind forming a short broad 

 blunt tail ; head broad, its tentacles very broad and thin, auriculate at the 



