266 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



2381,. 2655, 2668, 2674, 2714, and an unnumbered station 240 miles 

 east of Cape Cod) ; a station in the Gulf of Mexico, 2381 (Albatross) and 

 one in the Straits of Florida, 2642 (Albatross) [2]; and two stations, 

 probably in the western north Atlantic Ocean, 7518 and 7519 (Fish 

 Hawk). 



PYROSOMA ATLANTICUM, group INTERMEDIUM. 



Nine Albatross stations in the western north Atlantic Ocean, from 

 Florida to Cape Cod (2039, 2058[2], 2092, 2602, 2626[2], 2667, 2669, 

 2673, 2675), and two stations in the Gulf of Mexico, off the Florida 

 coast (2396. Albatross, and an unnumbered station "off Pensacola"). 



PYROSOMA ATLANTICUM, subspecies ECHINATUM. 



A colony from the Naples Zoological Station, labeled "Pyrosoma 

 elegans," probably from the western Mediterranean Sea. 



PYROSOMA ATLANTICUM, subspecies TRIANGULUM. 



Albatross Philippine Stations D 5402 and D 5410, in Philippine 

 waters, and an unnumbered station off Honshu, Japan. 



At several stations more than one species was collected. This 

 is of some interest as showing the possibility of hybridization. A 

 list of these stations, with the species collected from each, is as fol- 

 lows: Albatross dredging stations in Philippine waters — 5120, Pyro- 

 soma aUanticum atlanticum and P. verticillatum cylindricum; 5125, 

 the same forms: 5320, P. agassizi and P. hybridum; 5410, P. atlan- 

 ticum atlanticum and P. atlanticum triangulum; 5437, P. atlanticum 

 atlanticum and P. vercillatum cylindricum; 245S, P. agassizi and P. 

 hybridum; 5613, P. atlanticum aUanticum and P. spinosum; Carnegie 

 Magnetic Expedition, unnumbered station, between Hawaii and 

 California, P. aUanticum atlanticum, and P. atlanticum nawaiiense; 

 and an unnumbered station in the "south Pacific" Ocean, P. 

 atlanticum aUanticum and P. aUanticum, form dipleurosoma. 



LITERATURE CITED. 



Bonnier and Perez (1902). Sur un nouveau Pyrosome gigantcsque. Comp. rend. 

 Acad. Sci., vol. 134. 



Brooks (1906). Dipleurosoma. a new genus of Pyrosoma. Johns Hopkins Univ. 

 Circ, vol. 26, p. 5. 



(1906). The affinities of the pelagic Tunieates. No. 1. On a new Pyro- 

 soma (Dipleurosoma elliptica). Mem. National Aead. Sci., vol. 10. 



Burghause (1914). Kreislauf und Herzschlag bei Pyrosoma giganteum nebst Bemer- 

 kungen zum Leuchtvermogcn. Zeitschr. f. w. Zoologie, vol. 108, p. 430. 



Farran (1906). On the distribution of the Thaliacea and Pyrosoma in Irish waters. 

 Report of the Sea and Inland Fisheries of Ireland for 1896, pt. 2, Appendix I. 



Grobben (1882). Doliolum und soin Generations wechsel. Arb. zool. Inst, zu 

 Wien., vol. 4. p. 2. 



