110 



JOURNAL R. A. S. (CEYLON.J 



Order. Tecti-beanchiata. 



[Vol. III. 



Animal usually provided with a shell both in the larva and 

 adult state ; branchiae covered by the shell or mantle ; sexes 

 united. 



Fam. Pleuro-branchidje. 



Genus. Pleurobranchus. Cuv. 



Animal oblong, fleshy, convex above with a very large and 

 overspreading mantle. Foot large, equally outspreading, and 

 thus leaving a wide canal all round the body. Head distinct, 

 furnished with a veil, uniting on each side with the borders 

 of the foot, and with two tubular tentacles, which are split 

 anteriorly ; mouth at the extremity of a proboscis ; branchiae 

 composed of a double row of lamella, forming a plume on the 

 posterior right side, between the mantle and the foot. Anus 

 carried by a small tube behind the branchiae. Organs of 

 generation in front. Shell sometimes rudimentary, membranous, 

 with a tolerably distinct apex hidden in the thickness of the 

 mantle.—- Woodward, 



Pleurobranchus citrinus ? Euppel 



Orange-red ; mantle darker than the other parts of the 

 animal, and speckled with whitish spots. About 1 inch in 

 length. Ova reddish, in circular broad coils. 



Very common in Trincomalie. Found in low-water, on 

 coral stones and sea-weed, nearly throughout the year. Spawns 

 in May, June and July. 



Pleurobranchus reticulatus ? Gmel. 



Pale orange-red, reticulated mantle, and spotted purple. 

 About 2 inches long. Found near Fort Frederick, Trincomalie, 

 in shallow water among rocks. 



