344 CEYLON PEAKL OYSTER REPORT. 



Doris, spp. ? 



There are several small very much depressed Dorids from the east of the Gulf of 

 Manaar and the south end of Cheval Paar which I have not been able to identify. 

 They appear to belong to two closely allied species. One is represented by 8 specimens 

 from the Gulf of Manaar and 2 from Cheval Paar. The largest specimen measures 

 I'l centims. by 0'8 centim. The back is covered with uniform, blackish-brown, very 

 minute marbling or reticulation. The ground colour of the Manaar specimens is a 

 mahogany-brown, probably owing to the action of spirit ; of the Cheval specimens, 

 pale brownish-grey. The radula in the largest specimen consists of 45 rows of 

 18-0-18 teeth; in a specimen measuring 0'8 millim. by 0'5 millim. it is 39 rows of 

 16-0-16. The innermost 6 or 7 teeth are bifid at the apex, the rest are simply hooked. 

 From the margin of the radula the first 4 teeth increase in size, and from the fourth 

 to the centre again decrease regularly and rapidly. 



The foot is moderately broad ; its front margin not distinctly bilobed, but sharply 

 folded inwards in the middle line, the fold being flattened and fitting into a recess in 

 the under-surface of the notseum. The tentacles, which are minute and pointed, 

 appear to be attached to the sides of this recess. The notaBum is tough and densely 

 spiculose ; the branchial pore is small and 6-lobed. An examination of the gonads 

 failed to show any armature. 



The other species resembles the above in form and in structure of the front of the 

 foot, but the markings are more minute and diffuse. It is represented by 2 specimens 

 from Cheval Paar, the largest measuring 1*2 centims. by 1 centim., most of this size 

 being taken up by the wide margin of the notseum. 



The radula consists of 42 rows of 24-0-24 teeth, and, except for the inner teeth 

 being simple instead of bifid, closely resembles the first-mentioned species. 



FAMILY: 

 Doriopsis aurea (Q. and G.). 



The Doriopsidae are only represented by a single species, D. aurea, of which 

 one specimen was taken off Karativo on March 10th, 1902. 



The colour, when alive, as noted by Professor HEBDMAN, is " orange red with brown 

 orange spots, those along margin of mantle pale blue." The same coloration, though 

 much fainter, was noticeable in the spirit specimen, the orange red having become 

 yellow. 



QUOY and GAIMABD, in the "Voyage de 1' Astrolabe" (1, p. 265, plate xix., figs. 4 

 t 7), give a figure and description of Doris aurea. It is described as orange-red with 

 white spots (blue spots ringed with white in the figure) scattered over the back, 

 " parsem^ en dessus" (in the figure they are represented as in three rows, one median 

 and two lateral), branchiae 5, compoundly pinnate ; back elevated ; smooth rhinophores 

 with 15 lamellae and a distinct longitudinal ridge (in figure); length a little over 



