1884.] 'lightning' AND 'porcupine' EXPEDITIONS. 123 



Dr. Kobelt and M. Crosse have objected to the specific name 

 toyville-thomsoni as contravening the laws of Linnean nomenclature. 

 But the name is really one and single, although compound and 

 apparently double. The patronymic name Thomson and many 

 others in England are so very common that the bearers of it are 

 obliged to annex the second baptismal name by way of distinction. 

 My "own name by the bye is also a case in point. Linne himself 

 frequently used compound names for Testacea, viz. : pes-pelecani, 

 pes-lutrce, caput-serpentis, crista-gaili, stercus-muscarum, Auris- 

 MidcB, Auris-Jitdce, Auris-Diance, Tectum-persicum, ocuhis-capri, 

 cornu-militare, and Cornu- arietis . Here are a dozen such iustances 

 of Linnean names. 



V 30. Rissoa stefanisi l , Jeffreys. 



R. costulata, S. Wood, Crag Moll. i. p. 106, t. xi. f. 12, a, b. 



R. stefanisi, B. C. v. p. 208. 



Distribution. Throughout the Mediterranean, in few localities and 

 sparingly ; 40-600 fms. 



Fossil. Pliocene : Red and Coralline Crag, Belgian Crag, aud 

 Biot. I cannot agree with Monterosato that this is the same species 

 as Actceon pygmcea of Grateloup, a Miocene fossil of the Bordeaux 

 Basin, nor with Van den Broeck that it belongs to the Pyramidellidce. 

 The apex is not heterostrophe or sinistral, although intorted ; the 

 peristome is continuous ; and the pillar has no tooth or fold, only a 

 slight thickening. 



When I suggested the name stefanisi instead of costulata, 1 was 

 under the impression that Alder's name costulata, being older than 

 that of Wood, must be preferred to the latter. But I now believe 

 that Alder's species is merely a variety of R. similis, and that Risso's 

 R. costulata may be identical with R. variabilis of v. Miihlfeld. In 

 that case Wood's name might stand. However, 



" Confusion's cure lives not 

 In this confusion." — Shakespeare. 



D. Cingula. Spirally striated or smooth ; outer lip plain-edged. 



31. Rissoa striata, Adams. 



Turbo striatus, Ad. in Tr. Linn. Soc. hi. p. 66, t. xiii. f. 25, 26. 



R. striata, B. C. iv. p. 3/ ; v. p. 208, pi. lviii. f. 2. 



'Lightning' Exp. St. 2, 4, 5. 



'Porcupine' Exp. 1869: St. 19. 18/0: Atl. Vigo B. 



Distribution. From the arctic and northern seas in both hemi- 

 spheres to the iEgean and Teneriffe on one side, and Little Gull 

 Island in New York and Jamaica on the other side ; 0-96 fms. 



The American and arctic form is Cingula aculeus, Gould ( 1 84> 1) 

 =R. saxatilis, Moller (1842) = i?. arctica, Loven (1846). This 



1 Named in honour of the late General do Stefanis of Naples, who was an 

 assiduous conchologist, and made an extensive collection of shells from that 

 part of the Mediterranean. He rendered me much kind assistance. 



