INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 729 



Rhegmatodes tenuis a. Agassiz. (p. 454.) 



In Agassiz, Coutribations, vol. iv, p. 361, 1862 ; Catalogue, p. 95, figs. 136-138. 

 Buzzard's Bay and Vineyard Sound. 



Zygodactyla Grcenlandica Agassiz. Plate XXXVII, fig. 275. (p. 

 449.) 



Contributious, vol. iv, p. 3G0, 1862; A. Agassiz, Catalogue, p. 103, figs. 1.53-156. 

 JEquorca Grcenlandica Pdrou and Lesueur, Ann. du Mns., vol. xiv, p. 27, 1809 

 (t. A. Agassiz). 

 Buzzard's Bay to Greenland. Common in Vineyard Sound, in June 

 and July. 



J^QUOREA ALBIDA A. Agassiz. (p. 454.) 



In Agassiz, Contributions, vol. iv, p. 359, 1862; Catalogue, p. 110, figs. 160-162. 

 Buzzard's Bay (A. Agassiz). 



TiMA FORMOSA Agassiz. (p. 449.) 



Contributions, vol. iv, p. 362, 1862; A. Agassiz, Catalogue, p. 113, figs. 164-172. 



Vineyard Sound, February and April. Massachusetts Bay (A. 

 Agassiz). 



EuTEViA LIMPIDA A. Agassiz. (p. 454.) 



lu Agassiz, Contributions, vol. iv, p. 363, 1862 ; Catalogue, p. 116, figs. 173-178. 

 Buzzard's Bay, Naushon (A. Agassiz). 



Lafoea calcarata a. Agassiz. (p. 408.y 



Catalogue, p. 122, figs. 184-194. Lafoea cornuta Agassiz, Coutr., vol. iv, p. 351 

 (not of Laniouroux). Laodicea calcarata A. Agassiz, in Agassiz, Contributions, 

 vol. iv, p. 350, 1862. Camjyanularia dumosa Leidy, op. cit., p. 138, 1855 {not of 

 Fleming). 



South Carolina to Vineyard Sound; Buzzard's Bay and Vineyard 

 Sound. The hydrarium was abundant on floating Zostera and algie in 

 Vineyard Sound, creeping over Sertularia cornicina; also at low- water, 

 and in C to 8 fathoms on FhyUophoya ; Thimble Islands, in tide-pool, on 

 Vesicidaria. Charleston, South Carolina (McCready, described as a 

 constituent part of his Dynamena cornicina). 



Halecium gracile Verrill, sp. nov. (p. 328.) 



Stems slender, flexible, clustered, compound, consisting of many very 

 slender, united tubes, light brown or yellowish, pinnately much branched ; 

 branches alternate, ascending, long, slender, tapering, similar to the main 

 stem, and usually similarly subdividetl ; the branches and brauchlets 

 mostly arise from opposite sides of the stem, so that they stand nearly 

 in one plane ; ends of branches and the brauchlets simple, very slender, 

 translucent, whitish, divided into rather long segments; the articula- 

 tions not very conspicuous, somewhat oblique ; each segment usually 

 with a prominent cylindrical process, arising from near the upper end, 

 which, on the older branches, bears the hydroid cell, but on the young 

 brauchlets are themselves hydroid cells, furnished with a thin, slightly 



