MacFarlmul Frelimwaiy Account of Dorididse. 53 



19. Ancula pacifica sp. nov. 



from Monterey Bay, Calif. No. 181,280, U. S. National Museum. 



Body slightly compressed, smooth, limaciform, highest in front of bran 

 chiae, tapering behind to tip of the long pointed tail, in front sloping less 

 rapidly to the high rounded head. General ground-color clear translucent 

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

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

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

 phores backward, interrupted by the extra-branchial appendages and 

 prolonged for a very short distance beyond the last one. 



Head bluntly rounded, the tentacles slender, short and blunt; Rhino 

 phores without sheaths, large, perfoliate, with 9 leaves. At the base of the 

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

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

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

 tipped with orange; on each side of the branchiae 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, 2 mm.; height, 

 3.5 mm. 



Pharyngeal crop spherical, prominent, connate; labial armature strong, 

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

 teeth in 35 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 plates ; these plates absent in the first 8 to 

 10 rows but constant in the remaining portion ; pleura! teeth 2, the inner 

 most large with irregular base and concave triangular vertical body placed 

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

 bearing 11 to 17 sharp recurved denticles, and terminating above in a 

 strong hook ; the outer pleural tooth triangular, thin below and thicker 

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

 rows of extremely small hooks. 



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

 Monterey Bay; rare. 



Hopkinsia gen. nov. 



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

 set with long papillae simple or occasionally forked ; pallial margin not 

 set off 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 ; branchiae several, separate, simply pin 

 nate plumes 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 



