276 



ME. H. A. BAYLIS AND LT.-COL. CLAYTOX LANE ON 



female. These two forms are also clearly figured in liis later 

 paper (1861). The .size, number, and arrangement of the hooks, 

 in our material, appear to give good and constant specific 

 characters, and we feel little hesitation in concluding that Molin's 

 male " uncinatus '' corresponds to what will be described below <is 

 E. spinosissimus v. Linstow, while his female is a distinct form. 

 We are, therefore, faced with the necessity of deciding wdiich of 

 Molin's two forms is to be designated as the type of E. uncinatus. 

 A good and appropriate specific name already existing for the 

 form with 30 or more I'ows of hooks, we have thought it advisable 

 to retain it; and we feel justified in selecting Molin's female 

 form, with 6 rows of hooks, as the true E. uncinatus *. 



Our own material is scanty, consisting of one larval individual 

 found encysted in a Pinna and three very j'oung specimens from 

 a sting-ray, 2Iyliohatis nieuhofi. As none of these individuals 



Text-figure 24. 

 4. 



JEchinocepJialus uncinatus. Anterior end of larval specimen ; lateral view. 



contain fully-developed sexual organs, our description must 

 remain incomplete. 



The lips are not yet fully developed in anj of the specimens, 

 and we are unable to describe their structure. The head-bulb 

 (text-fig. 24) is ai-med with 6 rows of hooks, each row containing 

 between 40 and 50. The spines increase in size from before 



* The question of nomenclature is somewhat further complicated by the fact that 

 Shipley and Hornell appear to have submitted larval forms of a species of JSchino- 

 cephdiiis to both von Linstow and Stossich, and these two authorities held different 

 opinions as to their identity, von Linstow ascribed them to Molin's species 

 ■uncinatus, while Stossich created for them a new species, gracilis. We cannot, 

 hovi'ever, find anything in Stossich's (in Sliiplej^ and Hornell, 1906) remarks upon the 

 lai'vaj to justify this step, and as the specimens are definitely stated by both 

 authorities to have 6 rows of hooks, we regard the name gracilis as a synonym of 

 Mncinatus. 



