158 



sigmoid, its inner margin has a slight prominence near the 

 distal acute end ; both are densely fringed with short setae, as 

 well as having hairy surfaces, and project slightly beyond the 

 median process of the seventh thoracic segment. 



In an egg-bearing female the first and second pleopods 

 are areolate in both rami; the exopods in both instances 

 have teeth, but they are less numerous and weaker than in 

 the males. The setules near the margin are present. 



The marsupial plates are large and overlapping, the 

 eggs are internal in densely packed masses up to the dorsal 

 region, and even amongst the muscles which control the 

 pleopods. The mouth parts are very much modified. 



The end of the pleon has a deep vertical notch with its 

 roof slightly projecting behind ; this is rather obtusely pointed 

 and conspicuous from the side. 



Females without brood and young males approach each 

 other, though at an early stage the young male has a short 

 developing process to the seventh thoracic segment. In both 

 these cases the posterior notch, though not so deep, is more 

 roofed over by the triangular process than in the female with 

 brood, and the process is more acute. 



I have repeated the observation with regard to the eggs 

 with Circeis acuticaudata, Haswell, and have found the 

 young deep in the body apparently as well developed as those 

 immediately under the marsupial plates; few were in that 

 position, the majority — very numerous — were within the 

 body, even over the pleopods. 



As Dr. Hansen remarks, HaswelJia is closely allied to 

 Circeis, there being, as far as I am aware, only the character 

 of a dorsal process separating them. 



Gulf St. Vincent ; a common species. 



liaswellia cilicioides, n. sp. 



Plate X., figs. 12 to 23. 



The body is very convex, gradually narrowing towards 

 the anterior end; smooth, except on the pleon and uropods, 

 which are granulate and glabrous, except the margins of the 

 uropods, which are slightly hairy. 



The head is obliquely declivous and rounded in front. 

 The eyes are scarcely raised above the surface. 



The first and sixth thoracic segments are subequal in 

 length, the seventh produced as a process which is rather 

 broad, curved downwards, and distally obtusely rounded, 

 over-reaching the end of the pleon and excavat-ed a little 

 underneath. The epimeral plates of the thorax are vertical 

 in direction, not forming with their respective segments a 

 perceptible longitudinal groove. 



