162 M. Hesse on new or rare Crustacea 



and destitute of seta? ; the thorax much move finely and sparsely 

 punctured, more depressed at the sides in front, much more 

 deeply trisinuate behind, shiny black, and destitute of setse; 

 the scutcllum almost imperceptibly punctured ; the elytra more 

 roof-shaped, the stria? more irregular, narrower above than be- 

 low, filled with shorter and white hair, apical portion filled with 

 long golden-yellow seta?, protruding beyond the abdomen. 



The underside is not so densely clothed, and the femora are not 

 so densely punctured and are much more destitute of hair; the 

 tibia? much more finely punctured, the middle leg with no me- 

 dian spine, and the hind leg with little beyond an excrescence. 



This interesting species was presented to the National Collec- 

 tion by Mr. H. Norton, and is one of the most beautiful insects 

 in the genus. 



XXI. — Investigations on new or rare Crustacea of the French 

 Coasts. By M. Hesse*. 



§ NOTOPTEROPHORUS. 



M. Hesse has obtained individuals of all ages of the curious 

 Crustacean described by him (Ann. Sci. Nat. 5 e ser. tome i.) 

 under the name of Notopterophorus papilio, and now gives an 

 account of the life-history of the species. 



The male is one-third of the size of the female (2 mill, in 

 length), and has the head large and the body short and stout ; 

 and the thoracic region, which is of uniform width, does not 

 present an enlargement for the reception of the ova at its base. 



The abdominal portion, which is cylindrical, is also shorter 

 and more robust than in the female, and the dorsal membranous 

 expansions are but small at the base, whilst the lobes which 

 accompany them are very long, and gradually diminish to a 

 point. In number and position these expansions are exactly 

 similar to those of the female. The colour is a slightly yellowish 

 white, through which the large intestinal tube, of a yellow 

 colour, with red and black points, may be perceived. The eye is 

 black. The males occur in much smaller numbers than the 

 females, in the interior of Phallusia canina. 



In their early states the Notopterophuri resemble Cyclops. 

 The body is cylindrical, and formed of four thoracic segments 

 (including the cephalic shield), all of which present posteriorly 

 two triangular acuminate processes ; of these the points, directed 

 obliquely, project outwards and on the back, and they are evi- 

 dently destined to become the membranous expansions of the 



* Abstract, by W. S. Dallas, F.L.S. &c, from Annates des Sciences 

 Naturelles, 5 e ser. torn. iii. (1865) pp. 221-242. 



