INVEETEBEATE ANIMALS OF VINEYAED SOUND, ETC. 627 



naked space less than their own length ; the distance from the anterior 

 end of the middle fins to the anterior border of the head is equal to 

 twice the length of the fins ; the length of the latter is about one-sixth 

 of the entire length of the body. The color is translucent whitish, 

 nearly diaphanous. 



Length, about 16 ram ; diameter, about 0.9 mm . 



Wood's Hole and Yineyard Sound, at surface, July 1 ; off Gay Head, 

 among Salpce, September 8, in the day-time. 



Sag-itta, species undetermined, (p. 440.) 



A much larger and stouter species than the preceding was taken in 

 abundance by Mr. Yinal 1ST. Edwards, in Vineyard Sound, at various 

 dates, from January to May. 



Its length is generally 25 mm to 30 mm . I have not seen it living. 



GEPHYEEA or SIPUNCULOIDS. 



Phascolosoma cement aritjm. Yerrill Plate XVIII, fig. 92. (p. 416.) 



Sipunculus ccementarius Quatrefages, op. cit., vol. ii, p. 628, 1865. Phascolosoma 

 Bernhardus Pourtales, Proceedings American. Association for Adva ncement of 

 Science for 1851, p. 41, 1852. Sipuneulus Bernhardus Stimpson, Invertebrata of 

 r Grand Manan, p. 28 (rum Forbes.) 



Deeper parts of Vineyard Sound, 10 to 15 fathoms ; off Block Island, 

 29 fathoms ; Bay of Fundy, 2 to 90 fathoms, abundant ; near Saint 

 George's Bank, 45 to 430 fathoms. 



Phascolosoma, species undetermined, (p. 353.) 



A species similar to the last in size and form, with a thick integu- 

 ment, thickly covered throughout with small rounded papillae or granules, 

 but without the dark chitinous hooks seen on the posterior part of the 

 latter. 



Vineyard Sound. 



Phascolosoma Gouldii Diesing. Plate XVIII, fig. 93. -(p. 353.) 



Eevision der Ehyngodeen, op. cit., p. 764, 1859. Sipunculus Gouldii Ponrtales, 



Proceedings of American Association for tbe Advancement of Science for 



1851, vol. v, p. 40, 1852 ; Keferstein, Zeitschrift fur wissenschaftliche Zoologie, 



vol. xv, p. 434, Plate 33, fig. 32, 1865, and vol. xvii, p. 54, 1867. 



New Haven to Massachusetts Bay, at Chelsea Beach ; common in 



sand and gravel at low-water mark. 



SCOLECIDA. 

 TURBELLABIA. 



EHABDOCffiLA or NEMEETEANS. 



Balanoglossus aurantiacus Verrill. (p. 351.) 



Stimpsonia aurantiaca Girard, Proceedings Academy of Natural Sciences ot Phila- 

 delphia, vol. vi, p. 367, 1854. Balanoglossus Kowalevskii A. Agassiz, Memoirs 

 American Academy of Arts and Sciences, vol. ix, p. 421, Plates 1-3, 1873. 

 Fort Macon, North Carolina, to Naushon Island. Charleston, South 



