118 BULLETIN OF THE BUREAU OF FISHERIES. 



Habitat: In rocky tide pools all along the coast of Monterey Bay from Monterey to Point Lolins 

 and beyond. An abundant species found at all seasons of the year, nicst common during the summer 

 months, and the larjroet dorid found in the bay up to the present time. Its bright yellow color makes 



it a very i >|iieUi.iH .il.jeet at low tide. Usually very abundant on the piles nf the wharf at MunteTey 



in company \viili the •■ii\:\]\fr Archidorts monterei/eniii--!. 



Type nil. 1S11\S4, U. S. National Museum. 



Subfamily IV. DISOODORIDINJE. 



Body not hard, depressed; notrpum minutely granuligerous, pallial margin rather wide; tentacles 

 digitiform; branchial leaves nearly always tri- or quadripinnate; foot rather wide. Labial armature 

 (labial lamellae) made up of extremely minute, closely packed rods. Rhacbis of radula naked, 

 pleunc multidentate, the teeth hooked. IV-nis usually uuariued. 



Genus 3. DISCODOEIS Bergh. 



DUcodorh Bergh, Jahrbiicher d. deutsehen maliicozoologischeu Cesellschaft, IV, 1.S77, p. M. Mai. Unters.. XII. IS-7. 



p .118; Sup. I, 1880. p. 47: II. 1881, p. 108: XV, 1884, p. 0:S: XVI, 1, 1888, p. 80.i; XVII, 1890, p. 89.5. Rep. on Nudibr.. 



Challenger Reports, X, 1884, p. 92. System der Nudibr. Gasteropoden, 1892. p. 102, 



Body rather .soft, roundeil or oval in outline; the branchial aperture slightly crenulate, stellati', 



or bilabiate; anterior margin of the Indt bilabiate, the upper lip more or less notched. Prostate gland 



large. 



3. Discodoris heathi MacFarland. 



Discoduris heallii MacFarland, np, cit,, p. 3a, 



Body elliptical, broad, depressed; the notwum minutely tuberculate, nearly smooth. General 

 color light yellow, darker toward the median line; the notaum sprinkled everywhere with extremely 

 minute black or brown spots, giving the anipial a general dusty appearance. Irregularly scattered 

 over the dorsum a variable number of black, brown, or brownish-red flecks, the majority of them in 

 the mid-dorsal region. (PI. xxiii, fig. 6.) In alcohol the yellow color is lost and the dark spots become 

 lighter. 



Mantle margin thin, wide, crentilate, extending far bej'ond the foot, except at the ti|) of the tail. 

 The foot rather narrow, its anterior end abruptly rounded, bilabiate; the upper lip deeply notched, 

 the tail short and blunt. 



The head is small and inconspicuous, being almost concealed Ijy the mantle; the oral tentacles 

 long and cylindro-conical (pi. xviii, fig. 12), curved outward, 



Rhinophores (pi. xxiii, fig 6) moderately large, cylindro-conical, the stalk stout, the clavus perfo- 

 liate with 10-15 leaves; the whole organ retractile within a sheath with low, thin, slightly sinuous or 

 lobed margin. Color of the rhinophores slightly darker than the mantle, thickly sprinkled with 

 minute black spots. 



Branchial plumes 8-10, tripinnate, small, spreading, whitish-yellow, sprinkled with minute black 

 spots, deeply retractile within a low sheath, the margin of which is similar to that of the rhinophores. 

 Plumes arranged in an incomplete circle, closed behind by the low, conical anal papilla. Renal 

 opening on the right and slightly anterior to the base of the anal papilla. 



Total length of the animal up to 30 mm., its width 1.5 mm,, and height H mm. 



Mantle thick, fragile, densely spiculate, its inner surface tiiiekly strewn with niiimte Mack spots and 

 a few of thesame color scattered over the pseudo-peritoneum :iIiom. ih,. cintnil nrr\i.iis sxstem. 



Pharyngeal tube large, conical, 2 mm. long, dilating ra|iidly into the lar^ie |.liar\ ii<.'eal hull), about 

 4..5 mm. in length, 3 mm. wide and 2.5 mm. high, the rounded end of the radula sac projecting behind 

 and below for a distance of 1 mm. 



Labial disk elliptical, convex, the opening vertical, slit-like, a lateral fold on either side about 

 one-third the distance from the bottom to the to|i of the opening. The armature is light yellow in 

 color and consists of short, closely set rods « ith si|uarish ends about 42 u long by 3.5 ft wide, arranged 

 in two lameUee on the upper half of the sidis ( if the opening. Each lamella is approximately quadran- 

 gular in shape, the upper border prolonged backward in a triangular point ( pi. xviii. fig. 15). Length 

 of upper border 0.750 mm., of lower border 0.525 mm,, height of lamella 0.750 mm. 



