M0LLT7SCA OF THE ' CHALLENGEE, ' EXPEDITION. 285 



slightly emarginate. Inner lip : a thin narrow white glaze crosses 

 the body and borders the pillar, which is narrow, concave, with a 

 rounded, slightly twisted, and feebly marginated edge. There is 

 no tooth. H. 1. B.0'5. Penultimate whorl, height 0"2. Mouth, 

 height 0-65, breadth O'Sl. 



This fine species is only represented by one somewhat broken 

 specimen. In regard to the genua Actceonina of d'Orbigny, I 

 may offer a few remarks. The uame dates from 1850 ('Pro- 

 drome,' i. p. 353), and was intended for some fossil forms, 

 regarding which any one desirous of further information may 

 consult Morris and Lycett, " Molhisca from the Great Oolite," 

 Palaeont. Soc. Tol. i. p. 102, v. pp. 11, 12, xviii. pp. 14, 15, Sup- 

 plement, pp. 26-28, and 106, 107, pi. xxxi. f . 9, 13 ; Pictet, ' Pa- 

 leontologie,' 2nd ed. iii. pp. 102-106, ix. pp. 13-22 ; Chenu, 

 ' Manuel,' i. p. 225. I am not called on to discuss the forms 

 which have been embraced in this genus ; they seem to be a 

 somewhat miscellaneous assemblage; but I feel quite sure the 

 ' Challenger ' shell may very well come in under the convenient 

 definition of Pictet (I. c. supra), '^Acteonina — leur forme normale 

 est celle d'Acteons sans dents." 



Deshayes, in his 'Anim. s. Verteb.' Paris, ii., substitutes for 

 Actceonina the name OrtJiostoma as of earlier date. Agassiz, in 

 his 'Index universalis' (Soleure edit.), p. 764, quotes for this 

 name " Gray, Moll. 1840;" but the name Orthostoma belongs to 

 Conrad (Geol. Eep. N. York, p. 115), 1838, and was proposed 

 for a " Genus Nautileorum," which fact of itself would exclude 

 it from rivalry with Actceonina, apart altogether from the fact 

 that the name had been already proposed in 1831 by Ehrenberg 

 for a genus of Yermes, and by Serville in 1834 for some of the 

 Coleoptera. 



2. AcT^OK (Act^okina) CHAEli's, n. sp. 



St. 78. July 10, 1873. Lat. 37° 26' N., long. 25° 13' W. Off 

 San Miguel, Agores. 1000 fms. Glohiqerina-ooze. 



Shell. — Small, ovate, thin, translucent white, with flatly 

 rounded whorls, a short subscalar very bluntly tipped spire, a 

 largish roundish mouth, sinuated outer lip, and edentulous pillar. 

 Sculpture. Longitudinals — there are numerous, unequal sinuous, 

 hair-like, obsolete lines of growth. Spirals — the whole sur- 

 face is scored with flatfish rounded threads and shallow fur- 

 rows of half their breadth between ; these become feeble in the 

 Liisnsr. jGUBisr. — zoology, vol. xyii, , 21 



