278 Records of the Indian Museum. [Voi. . X, 



The mouth-parts are prominent, but the labrum is not mark- 

 edly bullate. It is quite smooth. The mandibles have six 

 sharply pointed teeth ; the outermost is separated by a consider- 

 able gap from the second, towards which it does not converge; 

 the two inner teeth are close together. The inner edge of the 

 first four teeth is pectinate. The whole appendage is minutely 

 pubescent and there is a short fringe of minute hairs on the inner 

 margin within the innermost tooth. The maxilla bears a single 

 stout yellow spine at the outer extremity of its cutting edge but^ 

 almost concealed by it, there are two smaller spines on each side ; 

 the edge is strongly sinuous with four distinct depressions; it is 

 clothed with soft flattened hairs of various lengths. The inner 

 maxilla is broad and stout, clothed with short soft hairs. 



The penis is moderately long and stout, smooth and taper- 

 ing. It is clothed with fine hairs. 



The eggs are remarkably small and numerous. They are 

 invisible individually to the naked eye but form a fairly stout 

 yellowish lamella that appears smooth and homogeneous until 

 examined with a strong lens. They are broadly oval in outline. 



Dimensions, of largest specimen. 



Length of capitulum . . 30 mm. 



Breadth of capitulum .. 30 ,, 



Length of peduncle . . 38 , , 



Breadth of peduncle . . 10 ,, 



Habitat. — Morrison Bay, Mergui Archipelago: on Rhizosto 

 mous medusa. 



Type.— No. 8711/10, Crust., Ind. Mus. 



A. investtgatoris is closely related to A. pellucida (Aurivillius) 

 and A. paciflca, Pilsbry, but is apparently distinguished from both 

 by the emargination of the capitulum above, by having five 

 lateral filaments on each side and by its longer cirri, as well as by 

 other characters more likely to be variable. 



Two specimens, one large and one small, were found together 

 on the edge of the uaibrella 01 a medusa by Capt. Sewell, while 

 another medusa of about a foot in diameter was surrounded in the 

 same region by a number of individuals of different sizes. None 

 were found on other specimens of the coelenterate examined at 

 the time. 



Genus Heteralepas, Pilsbry. 



Heteralepas (Paralepas) reticulata, sp. nov. 



(Pis. xxxiii, xxxiv, fig. 3.) 



The capitulum and peduncle are (in spirit) of an opaque 

 slightly yellowish tint, due to the muscular layer, which is 

 covered externally by a thick transparent, tough, quasi-cartilagin- 

 ous integument. The whole animal is very small. 



The capitulum is almost globular; there is no carinal crest, 

 but the posterior part and the sides are covered with a reticula- 



