SOUTELLIDIUM. 177 



cephalothoracic segment (fig. 1) in the female is ex- 

 tremely small ; the first abdominal segment is formed 

 by the almost complete union of two segments, the 

 point of junction being marked by a chitinous line 

 on each side ; the remaining abdominal segments, as 

 well as those of the tail, are very short and broad. 

 The inner tail-setse are considerably longer than the 

 abdomen. Eye consisting of one central and two 

 lateral lenses. Ovisac large, circular, and extending 

 considerably beyond the extremity of the tail. Length 

 -a^g-th of an inch (-98 mm.). 



Excepting one imperfect specimen, which had four 

 deep red bands across the body, I have not seen the 

 male of this species, but Dr. Glaus figures it, describ- 

 ing the anterior antennae as being modified for clasping, 

 and the fifth pair of feet diminished in size, as is usual. 

 Dr. Glaus asserts the secondary branch of the posterior 

 antenna to be 4-jointed, but after repeated examina- 

 tion, I have failed to satisfy myself of the exact state 

 of the case. In some of my specimens the branch 

 appeared, indeed, to be indistinctly (and perhaps 4-) 

 jointed, but the articulations were so faint that I 

 should have overlooked them altogether without care- 

 ful search ; and even yet I should hesitate to affirm 

 that there is more than a single joint. 



8. tisboides seems to be of rare occurrence. I have 

 taken one or two specimens at Roker, near Sunder- 

 land, on fronds of Laminaria saccharina, a few on 

 weeds in tide-pools at Clifden and Roundstone, and 

 a rather larger number on weeds in Porcressa Bay, 

 Scilly. 



VOL. II. M 



