The Fauna of the St. John Group. 35*7 



One of the most important scientific results of the expe- 

 dition remains to be noted. TJp to last summer, the de- 

 velopment of the Stomatopods had never been traced from 

 the eggs, owing propably to the difficulty of obtaining the 

 latter, for these crustaceans do not carry their eggs about 

 with them, but deposit them in their usually inaccessible 

 burrows ; but the softness of the coral rock permits of its 

 being broken up, and in this way a supply of eggs was 

 obtained by Prof. Brooks, who^was able to work out their 

 development in part at Green Turtle Key and to continue 

 it on preserved material during this past winter. Mor- 

 phologists will await the results of this investigation with 

 unusual interest. 



Illustrations of the Fauna of the St. John 



GrROUP. 



No. 4. — ON THE SMALLER EYED TRILOBITES OP DIVISION I., 



WITH A FEW REMARKS ON THE SPECIES OP THE HIGHER 



DIVISIONS OP THE GROUP. 



By G. F. Matthew, M.A., F.R.S.C. 



A. — THE SMALLER EYED TRILOBITES OF DIVISION I. 



(Abstract.) 

 The Trilobites described in this paper include represen- 

 tatives of the genera Ellipsocephalus, Agraulos, (or Arion- 

 ellus) Liostracus,* Ptychoparia and Solenopleura. These 

 genera, and especially Liostracus and Ptychoparia, are 

 closely related. From a study of the young of these two 

 genera, it would appear that Ellipsocephalus retains some 

 features which are not so prominent in the young or adult 

 of the other kinds, especially the eyelobe extending far 

 towards the back of the head, as in the oldest types of Para- 



*The two species here referred to Liostracus probably represent a 

 new genus, or perhaps Angelin's original genus, for it is difficult to 

 see how Liostracus, as defined by Linnarsson and Brogger, differs 

 from Ptychoparia, and from this genus the one in the St. John 

 group is distinct. 



