ELIOT : NUniBRANCHS FROM THE IXDO-PACIFIC. 24I 



radula consists of thirty-two rows, containing about one hundred 

 teeth, as a maximum, on each side of the rhachis. The rhachidian 

 teeth are shaped much as in Bergh's plates, with hollowed out bases, 

 but the denticles are somewhat less numerous. There are generally 

 seven or eight on each side of the central cusp, of which two or three 

 are on the cusp itself. The first lateral is broad and bears five den- 

 ticles on the outside : the next two laterals bear four or five denticles. 

 After that the teeth appear bifid (except a few which are quite smooth), 

 but below the two prongs there is often one and sometimes two small 

 denticles. 



This specimen is probably referable to Z. sarasinlca, recorded from 

 the East Coast of Ceylon. 



DORIDID^ PHANEROBRANCHIAT^. 



Thecacera Fleming. 



This little known genus appears not to have been examined since 

 the time of Alder and Hancock. They describe three British species, 

 and mention that Darwin found another in the Chonos Archipelago 

 on the West Coast of South America. 



Thecacei-a is practically a Polycera with large rhinophore sheaths. 

 The three British species seem to be well distinguished from one 

 another. T. pennigera is white with spots of black and brilliant 

 orange. It has no distinct oral veil, the branchiae are three, the extra- 

 l)ranchial appendages two, and the formula of the radula is 3-1-2. o. 

 2-1-3. T. virescens is peach-coloured with green markings. The 

 rhinophore sheaths are small and simple : the branchia; five, encircled 

 with a row of obtuse tubercles : the formula of the radula 5 -I- 2. o. 

 24-5. T. capitatii is white with greenish brown markings. It has a 

 tuberculate oral veil and tubercles on the sides of the back : seven 

 branchiae with a stoutish lobe on each side ; and a radula with 

 the formula 4-1- 2. o. 2-1-4. 



The species described below is very closely allied to T. pennigera. 



Thecacera maculata sp. nov. 



Cf. Alder & Hancock, " Mon, Brit. Nudibr.," Thecacera, gen. 5. 

 Thecacera pennigera, fam. i, pi. 21a. 



Two specimens from Karachi, evidently much contracted and dis- 

 torted. The largest, which is almost globular, is 6 mm. long, 5 mm. 

 broad, and 6 mm. high. The smaller is somewhat more elongate. 



The notes on the living animals say that they would not extend 

 themselves, but remained curled up. The body was of a very light 

 flesh colour, with black spots, and a few orange-red spots. In the 

 smaller specimens both kinds of spots were much more numerous. 

 The rhinophores and branchiae were splashed with orange red. The 

 intestines showed through the semi-transparent body. 



