508 



KEY. E. BOOG WATSON ON THE 



II. The SoleNocokchia, comprising the Genera Dentalium, 

 Siphodentalium , and Cadulus. By the Eev. R. BooG Wat- 

 son, B.A., r.L.S., &c. 



[Read November 21, 1878.] 



The subjoined list is an enumeration of the species of Deiitalium 

 referred to in detail. 



Dentalium. 



1. D. capillosum, JefFr. 10. D. longitrorsum^ Reeve. 



2. D. cBgeum^ W. 11. D. compressum, W. 



3. D. ampliialum, W. 12. D. suhterjissum, JefFr. 



4. D. ceras, AV. 13. Z>. didi/mum, W. 



5. D. diarrhox, W. 14. Z). yolcoJiamense, W. 



6. D. entalis, W. 15. D. dentalis, Linn. 



7. Z>. leptosceles, W. 16. D.javanum, Sow. 



8. Z). circumcinctum, W. 17. i>. ensiculus, JefFr. 



9. jD. acutissimum, W. 18. Z). tornatum, W. 



1. Dentalium capillosum, Jeffr.\ Jeffreys^ ''Valorous^ Re- 

 port, Proc. Boy. Soc. xxv. No. 173, 1876, p. 191. No. in list 26. 

 Do. Ann. Mag. Nat. Rist. 1877, xix. p. 153. 



St. II. Jan. 18, 1873. Lat. 38° 10' N., long. 9° 14' W. Setubal. 

 470 fms. OloUgerina- ooze. 1 specimen. 



(?) St. 24. Mar. 25, 1873. Off Culebra Is., St. Thomas, 

 D. "W. I. 390 fms. Mud. 



St. 73. June 30, 1873. Lat. 38° 30' N., long. 31° 14' W. 

 1000 fms. Glohigerina-ooze. "W. of Azores. 2 specimens. 



St. 78. July 10, 1873. Lat. 37° 24' N., long. 25° 13' W. 

 1000 fms. Glohigerina-ooze. Off San Miguel, Azores. 1 

 specimen, young, and 2 fragments. 



Mr. Gwyn Jeffreys gives this species as taken by the 

 ' Valorous ' at St. 12, 1450 fms. ; St. 13, 690 fms. ; St. 16, 

 1785 fins. ; by the ' Porcupine,' 1869, Bay of Biscay, 862 fms., N. 

 of Hebrides, 542 fms. ; and he states that Pourtales got it in the 

 Bay of Mexico, off Bahia Honda, in 418 fms. He has described the 

 ribs as " sharp (not rounded)." They rather seem to be sharply 

 cut ; but they are rounded on the top. L. 2*1 in. B. at mouth 

 0-22, at apex 036. 



The young specimen from St. 78 has at the apex on the convex 



