10 R. E. Lloyd : The Fauna of the Arabian Sea. [VOL. I, 



Diplacanthopoma squamiceps , sp. no v. 



Corresponds with the generic definition in the following res- 

 pects : — the form and arrangement of the fins, of the teeth and the 

 gills, in the number of the branchiostegals (8), in the absence of 

 pseudobranchise and pyloric cseca, in the obscurity of the lateral 

 line, and in the presence of radiating spines on the opercles. It 

 differs from all known species in this important respect : — there 

 are scales on the head as far forward as the posterior limit of the 

 eyes and on the opercles and sides of the head as far forward as a 

 line dropped vertically from the posterior border of the eyes. The 

 head is much depressed and the eyes are close together and look 

 upwards to a great extent, being separated by less than their dia- 

 meter ; this gives the head a very different appearance from that 

 of the other three known Indian species of the genus, in all of which 

 the eyes are separated by about if- times their diameter. 



There are deep mucus pits on the head and in a semicircle 

 below the orbits. 



There are no pseudobranchise, but in the position of these 

 organs there are two very short and slender filaments which are 

 vestiges of this organ. I find that the type specimens of D. rivers- 

 andersoni and D. raniceps have precisely similar vestiges. This 

 seems to be a strong argument for including this new species 

 under the genus Diplacanthopoma. 



The length of the head is 3^ in the total without the cau- 

 dal fin. 



The greatest height is one-sixth the length without the cau- 

 dal fin. 



The length of the eyes is a little less than the length of the 

 snout. 



There are 19 rays in the pectoral fins. 



The filaments composing the ventral fins are composed of 

 two rays. 



The male has a well-developed penis. 



Two specimens, a male and a female, both about five inches 

 long. 



Habitat — Off the S.-E. coast of Arabia ; 540 fathoms. 



Crustacea. 

 Squilla investigatoris , sp. nov. 



Eyes large, consisting of two subequal lobes. The carneal axis 

 is slightly oblique to, and a little longer than, the peduncular 

 axis. 



The rostrum s ovate, and is a little longer than its breadth at 

 the base, without a carina, but with raised lateral margins. 



There are five carinse on the carapace ; the median one be- 

 comes flattened out and obscured anteriorly, and a little less than a 

 rostrum's length behind the rostrum, it bifurcates. The antero- 

 lateral angles of the carapace bear spines, which do not extend 



