78 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



This form is quite common at the Tortugas, Florida, as indeed it is all over 

 the Tropical and Subtropical Atlantic. It is found in Charleston Ilarboi-, 

 South Carolina, but has not yet been taken north of the Carolina coast. 



Abyla quincunx, Chdn. 



Figs. 115-117, Plate 34. 



f Abyla pentagona, Huxley. T. H., 1859, Oceanic Hydrozoa, p. 40, 

 Polygastric I PI. II. Figs. 2-2-. 



Generation ^ Abylopsis quincunx, Chun, C, 1888, Sitzungsber. Akad. Wissen. 



(^ Berlin, Bd. XLIV. p. UGO. 



Aglaisma quincunx. 



fAglaisnioides Eschscholtzii, Chun, C, 1888, Sitzungsber. Akad. 

 Wissen. Berlin, Bd. XLIV. p. 1160. 

 Aglaismoides quincunx, Chun, C, 1897, Siphonophoren der Plank- 

 ton Expedition, p. 29. 



Chun found this Siphonophore in the Canary Islands, and it was taken by 

 the Plankton Expedition in the Gulf Stream and Sargasso Sea. Huxley, 

 1859, found it in the tropical regions of the Atlantic, Pacific, and Indian 

 Oceans. It has been taken by Agassiz and Mayer (1899 ; Bull. Mus. Com. 

 Zool., Vol. XXXII. p. 180) in the Fiji Islands. These South Pacific speci- 

 mens are, however, slightly different from those of the Atlantic in that their 

 tentacular nematocyst-batteries are usually colorless instead of more or less 

 orange, as in the Atlantic form. 



Chunia capillaria, nov. gen. et sp. 



Figure 90, Plate 27. 



Generic Characters. — Chunia, novum genus. This genus belongs to the 

 family Diphyida), Eschscholtz, and to the subfamily Abylinae, L. Agassiz. 

 It possesses a pentagonal, prismatic, anterior swimming-bell and a larger five- 

 sided, posterior swimming-bell. The siphosome bears a long, slightly curved, 

 sharp-pointed, hair-like bristle. The covering scales, or bracts, are leaf-shaped. 

 The monogastric sexual generation is unknown. 



Specific Characters. — The animal is about 10 mm. in length. The anterior 

 swimming-bell is prismatic, and possesses one oblique, five-sided face and 5 

 lateral faces. Four of these are plane, but the fifth is sharply concave. The 

 cavity of the swimming-bell opens upon this concave face. The bell cavity is 

 long and spindle-shaped, and is provided with 4 radial tubes and a velum. 

 There is a large spherical phyllocyst that gives rise to an apical caecum con- 

 taining a highly refractive " oil " globule. The hydrcBcium of the anterior 



