388 W. G. Van Name — Bermuda Ascidians. 



of the characters upon which Verrill based the species mxdtiphiala. 

 When the ovaries are ripe and are distended with large eggs, the 

 gonads become thick and swollen, and resemble in shape those shown 

 in Traustedt's figure, though I have not found them developed to 

 such an extent in any of the Bermuda specimens as was evidently 

 the case in the individual figured by the latter author. 



This species was collected both in 1898 and 1901. I obtained a 

 few individuals at Coney Island and Long Bird Island, but it appears 

 to be more common on the reefs than along the shore. A number 

 of large specimens were found washed up on the beach, but still 

 alive, at a place known as the " Scaur," on Somerset Island, May 5th, 

 1901. 



Styela MacLeay, 1824. 



Body attached, sessile, rarely pedunculated. 



Test usuallj^ coriaceous. 



Branchial sac with four folds on each side, or less. Dorsal lamina 

 a plain membrane. Tentacles simple. 



Reproductive organs on both sides of the body, attached to the 

 inner surface of the mantle. Ovaries consist of a small number of 

 elongated glandular tubes. Testes numerous, variousl}^ placed in 

 relation to the ovaries. 



Styela partita (Stimpson), var. bermudensis, nov. 



S. partita : Plate LV. Figure 69. Plate LVI. Figures 76 to 78 inclusive. 

 Plate LXIV. Figures 147 and 149. S. iKirtita var. bermudensis : Plate 

 LV. Figures 70 to 75 inclusive. .Plate LXIIT. Figures 142 and 143. 



In Prof. Verrill 's list (17) two species of Styela are mentioned as 

 having been found at Bermuda ; S. partita (Stimpson), a sjjecies 

 originally described from Boston Harbor, and occurring on the 

 Atlantic Coast of the United States from Massachusetts southward, 

 and the Mediterranean species, S. canopoides Heller (4), which has 

 also been recorded from the West Indies by Traustedt (16). 



After an examination of about 25 specimens of this genus col- 

 lected at various points about the Bermuda Islands in 1898 and 1901, 

 including those on which Prof. Verrill based his list, I have come to 

 a somewhat different conclusion. The Bermuda specimens vary a 

 great deal in nearly every character, but I cannot satisfy myself 

 from the material available that more than one species is really 

 represented. 



