434 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



The nematocysts of the column are partly 43.7-63.4 by (9)13- 

 17 IX, partly 68.5-74.7 by 22.5-25.5 ix (both atrichs), partly 33.8-41 

 by 7-8.5 IX (type a, with a thick long shaft), partly 19.7-22.6 by 

 2.8-3 IX (type c, with very short shaft), partly 21-22.6 by 2.2- 

 2.8 IX (with thin, long shaft; all three microbasic 6-mastigophors) ; 

 those of the marginal tentacles 25.4-28.2 by 4.2-5 /* (type b, shaft 

 about half as long as the capsule; microbasic 6-mastigophors) ; 

 those of the labial tentacles partly 31 by 5.6-6.3 ix (atrichs, very 

 rare) , partly 31-39.5 by 7-8.5 ix (type a) , partly 24-28.2 by 4.2-5 /i 

 (type b), partly 16.2-21 by 2.8-3.5 (type c; all three microbasic 

 &-mastigophors) ; those of the actinopharynx partly 28.2-36.7 by 

 5.6-7 /x (atrichs, few), partly (31)35.2-42.3 by 6.3-8.5 ii (type a) ; 

 partly 26.8-35.2 by 4.2-5.6 ix (type b), partly 18.3-24 by 4.5 /x 

 (type c, all three microbasic 6-mastigophors) ; those of the cnido- 

 glandular tract partly 26-27 by 5-6.3 /x (type a), partly 14-19.7 

 by 2.8-2.5 (type c; both microbasic 6-mastigophors) ; those of the 

 craspedonomes of the ciliated tract 19.7-22.6 by 3.5-4.2 /t (type 

 b, microbasic b-mastigophors) ; those of the larger cnidorages 

 66.3-73 by 14-18.3 ix, those of the smaller 53.6-60 by 12.7-15.5 

 (both microbasic ^-mastigophors), moreover, a few 6-mastigo- 

 phors with thin long shaft about 22.6 by 4.2-5.6 yn. The column, 

 marginal and labial tentacles, and the craspedonemes are provided 

 with spirocysts. 



Color in alcohol. — Column grayish brown, oral disc and labial 

 tentacles red-brown, marginal tentacles almost uncolored, probably 

 not banded. 



Measurements. — The largest specimen in contracted state about 

 12 cm. in length, 2 cm. in greatest breadth. 



Collecting records. — San Lucas Cove, south of Santa Rosalia, 

 March 29, 1940, two specimens; Angeles Bay, April 1, 1940, one 

 specimen ; Estero de la Luna, Sonora, Mexico, April 10, 1940, one 

 specimen. 



Additional distribution record. — San Diego Bay, southern Cali- 

 fornia. 



Remarks. — The name Botryanthus proposed by McMurrich 

 (1910) for the genus is probably a typographical error. In 1912 

 (pp. 44-46) I made a summary of the organization based on 

 Torrey and Kleeberger's description of the species. In the present 

 paper this description is completed. Figure 81, d, shows cnidorages 

 (Cn) on a branched craspedoneme. The apex and the base of the 

 branches are devoid of cnidorages, which are of very different size. 

 Torrey and Kleeberger (1909) deny the supposition of von 

 Beneden that the cnidorages are homologous with the acontia. 



