148 Miscellaneous. 



Further Note on the Generic Name Muelleria. 

 By F. Jefpkey Bell. 



I MiGBT have saved myself all the mental trouble to ■which I gave 

 expression on p. 392 of the last volume of the ' Annals ' had I 

 remembered that Bronn, in a footnote to the explanation of pi. xlviii. 

 of Band ii. of his ' Klassen und Ordnungen ' (1860), says that 

 Mulleria has been used five times before Jager, and wiites '■'■Actino- 

 pyga Lecanora, nob. {Mulleria Lecanora, Jag.)." Jaegeria, then, 

 must be withdrawn, and the very excellent name of Actinopyga 

 used in its place. I may advise the possessors of Mr. Scudder's 

 ' Nomenclator Zoologicus ' to add, in its alphabetical order, 



^'■Actinopyga, Bronn, Hoi. 1860." 



On a Copepod (Cancerilla tubulata, Dalyell) parasitic upon Am- 

 phiura squamata, Delle Chiaje. By M. A. Giaed. 



In 1879 the author noticed the existence on the French coast of 

 a curious Copepod parasitic upon Ampliiura squamata *. A single 

 specimen of the species had been observed and figured by Dalyell in 

 1851 (' Powers of the Creator,' vol. i. p. 223, pi. Ixii. figs. 1-5) 

 under the name of Cancerilla tubulata. At Wimereux the parasite 

 is exceedingly rare ; it is more abundant at Concarneau, where it 

 •was probably observed by P. J. van Beneden (' Commensaux et 

 Parasites,' p. 138) ; but it is at Fecamp that it may be most con- 

 veniently studied. There the Amphiiira is very common in the 

 small pools with Corallines, and about one in every ten is infested 

 by the parasite. The female Cancerilla is generally attached to the 

 oral surface of the disk at the base of one of the arms, with its 

 head turned towards the mouth of its host. The body of the para- 

 site and its two ovigerous sacs are usually about the same size and 

 arranged in a triangle, which is easily seen by the naked eye. 



The eephalothorax is widened transversely and in form resembles 

 the carapace of the common crab, whence the name of Cancerilla. 

 It has a membranous lateral margin bearing stiff hairs. The first 

 pair of antennae are short, seven-jointed, with joints one and two 

 larger and closely soldered together. They bear numerous hairs, 

 especially on the outer side. The antennae of the second pair are 

 rather long and converted into prehensile organs, terminated by a 

 strong hook. The mandibles are reduced to a styloid appendage 

 with a tuft of very fine hairs at the extremity. The maxillae have 

 a wide base bearing three strong divergent points, striated trans- 

 versely at the end. The two pairs of foot-jaws are robust and 

 organized for prehension. The first pair of thoracic feet is biramose ; 



* Journ. Anat. et Physiul. t. xv. p. 452, note 1. 



