SAGITELLA SP. 153 



ISagitella bobrelzkii N. Wagner, Op. cit., 1872, 3, p. 344. 

 Sagitcllo barhala Uljanin, Arehiv. zool. exppr., 1878, 8, p. 6, pi. 1, fig. 2. 

 'fSagileUa praccox Uljanin, Op. cit., 1878, 8, p. 8, pi. 1, fig. 3. 

 Acicularia virchmvii Geeeff, Zeitsch. wiss. zool., 1879, 32, p. 244. 



This species is very widespread in tlie warmer regions of the Atlantic and 

 Indian Oceans and their arms, and will probably be found to be equally common 

 in the Pacific. However, in the present collection the species is represented 

 only bj^ a single specimen 4 mm. in length. It seems fully to agree with the 

 forms taken in other regions. 



Locality. Gilbert Islands: off .Arnho Reef. Surface by night light. 

 21 January, 1900. 



Sagitella N. Wagner. 



Trav. Soc. nat. St. Petersb., 1872, 3, p. 344; Reibisch, Ergebn. Atlant. Ocean * * * Plankton-exped., 



1895, 2, H. c, p. 51. 

 Acicularia L.angerhans, Monatsb. K. akad. wissens. Berlin, 1877, p. 727; Gbeeff, Zeitschr. wiss. zool., 



1879, 32, p. 237. 



Sagitella kowalewskii N. Wagner. 



Soffitella kowalewskii form a N. Wagner, Trav. Soc. nat. St. Petersb., 1872, 3, p. 344; Uljanin, Arehiv. 



zool. exper., 1878, 8, p. 4, pi. 1, fig. 1; Reibisch, Ergebn. .Atlant. Ocean * * * Plankton-e.xped., 1895, 



2, H. c, p. 56. 

 Acicularia nrchomii Langerh.ujs, Monatsb. K. akad. wissens. Berlin, 1877, p. 727; Greeff, Zeitschr. 



wiss. zool., 1879, 32, p. 237, pi. 13, fig. 1-18. 



A single much rubbed specimen seems to conform to this species, the only 

 one so far recorded in the genus. It is the largest specimen so far reported, 

 having a length of 17 mm., though composed of only nearly forty-three somites, 

 whereas Reibisch found fifty in a specimen from the Atlantic 15 mm. in 

 length. The number is usually under forty. The slender fusiform body has 

 the usual transparent, glass-hke appearance. One cirrus, with edges rolled in 

 the typical way, is present on the head, but all others are lost. As seems to be 

 normal in fully grown specimens, the parapodia are but slightly developed 

 excepting in the caudal region. 



Locality. About halfway between the Galapagos and the Paumotu 

 Group (Manga Reva): Sta. 4728 (lat. 13° 47' 30" S., long. 114° 22' W.). 300 

 fms. to surface. Surface temp. 77° F. 19 January, 1905. One specimen. 



Sagitella sp. a. 



A very small specimen 4.5 nam. long has the characteristically slender and 

 glass-like, transparent body of S. kowalewskii N. Wagner. It is not in condition 



