CESTODARIA 451 



for the head, both these species also are essentially identical 

 with the five species of Caryophy llaeus above named. 

 Finally, Cooper (6) has described, under the name of ' Glari- 

 dacris catostomi', a species (from a Cyprinoid fish) 

 which also ' closely resembles ' the aforesaid five species of 

 Caryphy llaeus and the two species described by Linton 

 in general structure, and possesses a ' scolex ' which is ' quite 

 similar at least in outward appearance to that of A r c h i g e t e s 

 brachyurus, Mrazek '. Cooper appears to have been 

 unacquainted with the work of Linton on ' M o n o b o t h r i u m ', 

 since he supposes that his ' G 1 a r i d a c r i s ' is ' the first 

 member of the group [Caryophyllaeidae] to be described 

 from America '. He bases his new genus ' Glaridacris ' 

 mainly on the characters of the ' scolex '. Now this ' scolex ' 

 of 'Glaridacris', ' w^ien not strongly contracted, has 

 somewhat the form of a truncated rectangular pyramid with 

 the longer diameter in the transverse direction . . . the edges 

 of the base and the apex protrude markedly, in this latter case 

 forming a terminal disc comparable to that of many of the 

 bothriocephalid Cestodes. The dorsal and ventral faces of 

 the organ are each divided by two ridges converging towards the 

 apex into three sucking grooves or loculi, of which the middle 

 is best developed and most efficacious during life. It is also 

 the last to become smoothed out with strong contraction of the 

 whole scolex. The lateral loculi are, furthermore, not in the 

 same plane with the medial one but inclined towards the corre- 

 sponding ones of the opposite surface so that the edges of the 

 scolex, especially just behind the terminal disc, are often not 

 much thicker than the ridges betw^een the loculi . . . the scolex 

 of this form assumes a greater variety of shapes than that of 

 any other tapeworm I have yet examined, in which respect it 

 is comparable to the leaf-like anterior end of Caryophyl- 

 laeus.' From which description and from Cooper's figures, 

 it is evident that the 'scolex' of 'Glaridacris', besides 

 resembling that of A r c h i g e t e s brachyurus, is extremely 

 similar to the head of Linton's 'Monobothrium hexa- 

 cotyle', which also has six loculi and a central papilla 

 (' which may project forward as a sharp conical elevation or be 



