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PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 389 



of Coryphella than with that of any of the related genera. It was orig- 

 inally referred to Cuthona on account of the lateral expansions of the 

 head. The odontophore is remarkably higli and narrow ; the central 

 teeth are dark brown, large, strong, with the median point very large, 

 compressed, and curved forward, i)rojectiug far beyond the small, sharp, 

 lateral denticles, of which there are usually eight or nine on each side; 

 lateral teeth thin, pale, comparatively small, narrow, acute, without any 

 denticles, or rarely with some very small ones near the base, which is 

 rounded and but little expanded. 



This species occurs from Massachusetts Bay to Halifax, Nova Scotia, 

 and from low-water to 50 fathoms. 



Facelina Bostoniensis (Coutlioiiy) Vci-rill & Emorton. 



This species has been very much misunderstood, and totally different 

 species* have often been confounded with it. It is, however, very 

 easily distinguished from all of our other species. It is the only known 

 species from the New England coast that has the dorsal .tentacles dis- 

 tinctly laminated or i)licated. 



It is a true Facelina., having only a single row of teeth, with the cen- 

 tral denticle iirominent. 



It is common from above low-water to 20 fathoms, on Obelia and other 

 hydroids, from Massachusetts Bay to Block Island and Newport, R. I. 

 This season it occurred abundantly among Obelia geniculata, on Lanii- 

 naria, off Block Island, in 18 to 20 fathoms, associated with large num- 

 bers of LamelUdoris miiricata. 



This species is very closely related to the European species, Facelina 

 Drummondii (Thomp., 1843) and F. elegans (Alder & Hancock). 



Facelina pilata (Gould) Verrill & Emerton. 



In its dentition this species agrees closely with the preceding, having 

 but a single row of teeth, of nearly the same form. It should be 

 referred properly to Facelina.^ although it does not agree strictly with 

 the diagnoses of that genus, especially' in respect to the lamination of 

 the dorsal tentacles, which are, in this species, nearly smooth. This 

 character is, however, variable in this genus, the laminai being very 

 prominent in F. coronata, rudimentary in F. elegans, and absent in 

 F. pilata. 



Cratena Veronicae Verrill, sp. nov. 



Size moderate, about 25'""' in length, rather stout. Dorsal papilhe 

 cylindrical, obtuse, moderately slender, arranged in twelve to fifteen 

 regular transverse series on each side, the middle ones containing eight 

 to ten or more papilhe ; anterior groups smaller, situated well forward, 



*The species described by Bergh (Anat. Bid. til Kundskab. om Jiolidierue, p. 102, 

 pi. 5 a, 1864) uuder tlie name of Coryphella Bostoniensia is entirely distinct. It has 

 three rows of teeth, and is closely related to Coryphella Manancnsis Verrill (Stinipsou 

 sp.), common on our northern coasts. 



