1885.] 'lightning' AND 'porcupine' EXPEDITIONS. 51 



Distribution. Finmark, Lofodeu I., West Norwaj^ between the 

 Faroes and Hebrides, Shetlandj Bay of Biscay, Mediterraneau, and 

 Adriatic; 40-913 fms. 



Fossil. Pliocene : Belgian Crag(Fa« Beneden, as A. pes-carbonis), 

 Calabria and Sicily {Philippi and others as Chenopus desciscens). 



I extract from my notes made in the ' Porcupine ' Expedition 

 of 1862, the following description of the animal of the variety 

 macandrece : — Body cream-colour : snout cyhndiical and extensible, 

 pinkish, with a yellow streak half way down the middle in front ; 

 the extremity is edged with a yellowish rim or border and is also of 

 the same colour underneath : tentacles thread-like and very slender, 

 marked with a narrow white line down the middle in front : eyes 

 very small, sessile on the tentacles at their outer base : foot long 

 and narrow, squarish in front and pointed behind. 



Having since the publication of my work on British Couchology 

 dredged on the western coast of Ireland, as well as in the northern 

 part of our seas, specimens of much larger size than those which I 

 had described as A. macandrece, even exceeding those of A. serve- 

 sianus from the Mediterranean, I now feel myself obliged to give up 

 my species and to consider it a variety. 



My suspicion that Chenopus desciscens of Philippi was a fossil 

 representative or form of the present species, or rather of the variety 

 macandrece, has been verified by a comparison with recent specimens, 

 which has been effected through the obliging transmission by Prof. 

 Seguenza of fossil specimens of C. desciscens. I may here remark 

 that Philippi, in his 'Handbuch der Couchyliologie und Malaco- 

 zoologie ' (published nine years after the last volume of his work on 

 the AloUusca of the Two Sicilies), restored the far older generic name 

 Aporrhdis and substituted it for Chenopus. 



It is almost impossible to say whether Rostellaria pes-carbonis of 

 Brongniart was intended for A. serresianus or for some other 

 Pliocene species from the Vicentia district. His description and 

 6gure were necessarily incomplete, being avowedly founded on a 

 fragmentary and very imperfect specimen. I have received from 

 correspondents under the former name a very different species from 

 A. serresianus. 



Family XXVIII. Cerithiid^. 



This family has been lately placed by the Marquis di Monterosato 

 between Muricidce and PleurotomidcB, although no reason is given 

 for this apparently strange allocation. While giving my old friend 

 and correspondent full credit for his knowledge of Mediterranean 

 shells, and for his industry which is evidenced by his last work, 

 ' Nomeuclatura generica e specifica di alcune Conchiglie Mediter- 

 ranee,' I cannot help regretting that he has not described the 

 numerous so-called species to which he has from time to time given 

 names only. These names cannot be recognized under the present 

 or perhaps any system of classification, but must be treated as 

 manuscript. With respect to his proposed multiplication of new 



4* 



