248 Transactions. — Zoology. 



name of cheesemanii be given it. This will identify it if 

 future inquiry defines it to be the same, and, if not, it will 

 be a further small tribute to so record the name of an earnest 

 and assiduous worker in the cause of science. 



Group TETRODONTINA. 



Genus Tetrodon. 



Sub-genus Gasteophtsus. 



T. cheesemanii, sp. nov. 



This fish is also of robust form, though it differs very 

 much in its proportions from the last, the body being more 

 elongated, though the head is more pronounced. The profile 

 of front of face rises rapidly to opposite the nostrils, whence 

 it obtusely runs back in an almost fiat line to behind the 

 vertical over rear of orbit, thence it gently curves to midway 

 between this station and origin of dorsal, falling gently to 

 such origin. Between the dorsal and origin of caudal profile 

 view gives an idea of slenderness not borne out in fact, as 

 that part, from a dorsal aspect, is seen to be widened con- 

 siderably, there being quite a depression along the median 

 line (but this is lost on contraction after immersion in spirit). 

 The top of the head and iuterorbital space are almost flat 

 and quite wide, and the anterior part of the back keeps like 

 this, with but slight transverse convexity for some distance. 

 The sides and cheeks are flattened. The lower part of each 

 side of the body from the chin along under the cheeks and 

 thence on towards the tail has a very strongly-marked ridge, 

 angle, or keel, which forms a striking delimitation between 

 the silvery lustre of the sides and the plain dead-white of the 

 lower surface. The ridge or keeled projection much increases 

 the lateral stoutness, and gives a very flattened appearance 

 to the ventral aspect of the fish — in fact, it has what the 

 nautical designer would term a "very hard bilge." From its 

 running, though in a lessened altitude, round the chin it 

 gives greater prominence than usual to such feature. This 

 fish though capable of considerable distension of its skin, has 

 not, such capacity to the same extent as the first-described 

 Tetrodon, as in this instance it is confined to the skin of the 

 throat and belly only. These parts are armed with fine short 

 spines set in close and parallel rows in furrows running from 

 the chin backwards. Between such furrows the whole of the 

 skin of the localities named is divided into peculiar little 

 flat-topped areas, oblong-rectangular and ovate in shape, 

 and of enamel-white colour, running in regular rotation, the 

 interspaces, of course, being more pronounced if the skin 

 thereabout be distended. To the naked eye it resembles a 



