388 W. K. BROOKS ON THE LIFE-HISTORY 



though Fewkes states (21, page 153) under the heading Turritopsis nutricola, in hi* 

 description of a medusa which he wrongly supposes to be a Turritopsis, that McCrady's 

 description is "quite faulty," and that there is nothing which corresponds to his "long 

 description of what he calls a cellular upper portion of the proboscis." 



Distribution of the Germs. So far as our present knowledge goes, the genus is dis- 

 tributed as follows: Messina, Mediterranean (Kollikcr, Gegenbaur, Keferstein, Elders, 

 Ilaeckel); St. Yaast, Normandy (Keferstein); Australia ( Peron & LeSueuer ) ; 

 Charleston, South Carolina. ('. S. (McCrady); Beaufort, North Carolina (Brooks); 

 Hampton Roads, Ya. (Brooks); Naushon, Buzzard's Bay (A. A.gassiz.) 



Turritopsis nutricula, McCrady. 



Turritopsis nutricula, McCrady, 1856. Description of Oceania (Turritopsis) nutricula, 



nov. spec and the embryological history of a singular medusoid larva found in the 



cavity of its bell. Plates 4 & 5. 



McCrady, 1857. Gymnophthahnata of Charleston Harbor, page 127. Plate 8. 



L. Agassiz, 1865. Contributions iv, p. 347. 



Ilaeckel, 1879. System der Medusen, p. 66. 



Brooks, 1883. Studies Biol. Lab., 11, p. 465. 

 Oceania nutricula, McCrady, 1856. Description, etc. 

 Mbdeeria multitentaculata, Fewkes, 1881. Bull. Mus. Comp. Zool., vnr, 8, page 149, 



PI. 3, tigs. 7, S, [). 

 Modeeria nidricola, Fewkes, 1882, Bull. Mus. Com}). Zool., ix, 8, page 295. 



Species-Diagnosis. Umbrella nearly flat on top. In profile view the upper third is 

 nearly rectangular, while the outline slopes outwards in lower two-thirds. Diameter of 

 umbrella about three-fourths of height. The large proboscis nearly tills the upper portion 

 of the sub-umbrella. The upper wider than the lower half, cubical, and made up of four 

 masses of endoderm cells, perforated by the channels of the radiating tubes. Digestive 

 cavity, making about half total length of proboscis, cubical, ending below in four simple 

 large lips, fringed with stalked bunches of lasso-cells, and nearly reaching level of velum, or 

 sometimes reaching below it. Four very large ovoidal reproductive organs, separated from 

 each other by deep interradial furrows, rounded below but divided above into two lobes 

 which run up for a short distance on sides of radiating tubes. 



One hundred or more tentacles, placed close together around bell-margin, and consist- 

 ing of an enlarged bulb, a long slender contractile shaft, and a slight terminal clavate 

 enlargement. Tentacles capable of extension to three or four times diameter of umbrella 

 and with a single ocellus on axial side of basal bulb. 



Color. Umbrella transparent-reddish brown; reproductive organs, reddish orange; 

 interradial furrows, deep lake; lips frosted, base and tip of tentacles red, shaft a wry 

 faint purple. 



Size. About 6 mm. wide, and 8 mm. high. 



Ontogeny. Larva a branching tubularian hydroid, with a fusiform body, and three ir- 

 regular rows of short filliform tentacles. It is a member of Weismann's genus Dendro- 



