418 APPENDIX. No. IV. 



Entomostkaca. 

 Two new species of the genus Caligus of Miiller were found on fishes. 



Myeiapoda. 



luLUS, two species, one of which is new. 

 ScoLOPEXDRA, one nondescript species. 



Ixsecta. 



Thirty-six species only reached England in a tolerable state, the rest wera 

 entirely destroyed by insects and damp. Amongst them is a new genus of 

 the family Scardbccidea, and probably there are five or six new species, wliich 

 I liave not yet found time to examine. 



Anneleides. 



A new species o( Nereis was taken in a bit of floating wood 0, 21, N. lat. 

 5, 49, 37 E. long, together with a genus not known to me. 



Entozoa. 



One species of this parasitical class, was taken out of tlie intestinal canal of an 

 albicore. 



ACALEPH^; 



PonpiTA. Disc cartilaginous, round, composed of rays. Stomach central and 

 round. Mouth shghtly prominent and capable of very great distention. 

 Whole imderside covered by tentacula, those of the middle terminated by 

 suckers, tliose next the margin larger (and simjile or at least terminated by 

 indistinct suckers.*) 



Of this genus, to which the above characters are now given, a new 

 species, was found in S, 12, N. lat. 18, \i, f W. long, viz, 

 Porpita gTanulata. The rays of the upper part of the disc granulated by pairs. 

 The stomach of one specimen was filled ^nth the debris of a fish. 



* In specimens of very soft animals preserved in spirits of wine, where the organs are 

 much contracted, it is generally impossible to ascertain all the characters of each part. 

 Naturalists should therefore lake every opportunity to describe them whilst alive, since 

 all arc not gifted with the extraordinary powers of a Savigny. 



