EEPORT ON THE CLECIDiE. 



683 



Testa adulta, tubularrs, conica, leviter biarcuata, subflava, nitida, annulis regularibus, 

 rotuudatis, valde obliquis, minimis, paulo expressis, crebris, elegantissime cincta. Aper- 

 tura valde oblicuia, anuulo lato erasso valde promiuente circurudata. 



Length, 0*1 in. Breadth, 0^02 in. 



This very remarkable and elegant form is extremely conical. It starts with a rather regular 

 curve, and towards the mouth bends suddenly in the same direction as the very oblique aperture. 

 It is yellowish glossy and very beautifully ornamented with numerous small, transverse, oblique rings 

 slightly expressed; but well rounded, and though close- set yet well defined. The very oblique mouth 

 is strengthened by a large and very prominent ring, which indicates the adult condition of the shell. 

 This fact of the shells being full-grown implies that no further decollation was to take place, while 

 the fineness of the pointed apex indicates that only one has occurred already. The septum of the 

 apex is smooth, with a minute, scarce visible mamillation in one specimen, which is even less marked 

 on the second. The third is broken. 



All appearances point to the Caecidae as the true position of this beautiful and interesting little 

 shell ; but even should this prove a mistake, it will still constitute in any case a remarkable genus. 



4. CcBcum, Fleming, 1842. 



1. Caecum lineicinctum, de Folin. 



2. Caecum attenuation, de Folin. 



3. Ccecum sepimentum, de Folin. 



4. Ccecum, n. sp. 



5. Caecum chinense, de Folin. 



6. Caecum subflavum, de Folin. 



7. Ccecum succineum, de Folin. 



8. Caecum microcyclus, de Folin. 



: 9. Caecum elegantissimum, Carp. 



10. Cxcum regulate, Carp. 



11. Ccecum exile, de Folin. 



12. Caecum crystallinum, de Folin. 



13. Ccecum angustum, de Folin. 



14. Caecum ehurncum, de Folin. 



(15.) Ccecum vitreum, Carp, (see pp. 680, 689). 

 (16.) Caecum pollicare, Carp, (see pp. 680, 689). 



1. Ccecum lineicinctum, de Folin (Cmcivm, PI. II. figs. 7, 8). 



Caecum lineicinctum, de Folin, Caecidae of the Challenger Expedition, Proc. Zool. Soc. Lond., 1879. 

 p. 808. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. Off Culebra 

 Island, West Indies. 390 fathoms. Pteropod ooze. One specimen. 



Testa subcylindrica, paruni arcuata, albida, subopaca, sublsevis, nitida, aperturam versus 

 lineis transversis cincta. Apertura ? Septo mucronato, leviter circumdato. 

 Length, 01 in. Breadth, 0-028 in. 



The solitary specimen of this species is in bad condition ; but the shell is obviously glossy, nearly 

 opaque, whitish and almost smooth, with a few strong transverse lines like minute rings towards the 

 mouth, which is broken. The mucronated septum has possibly been much larger ; for it seems 

 eroded. Like all dactyliform septa it is surrounded by a portion of the tube, which projects so as to 

 protect it. It is the first smooth or nearly smooth Caecum I have seen with a septum of this char- 

 acter ; and, misled by this feature, I at first considered it to be a specimen of Ccecum reversum, 

 Carp. ; but that species belongs to his group Farluhim, with which the specimen in hand has nothing 

 to do. I believe it to be a new species. 



