MKIH'S.K OF WOODS HOLE REGION. 



43 



I'amih THAIMANTIID.-E. 



K EY TO THK GENERA. 



\ Radial canals, 4; marginal tentacles numerous and with basal cirri Laodicea 



B. Radial canals, 1: marginal tentacles aumerous, but without basal >-irri Staurostonw 



«'. Radial canals, 8; marginal tentacles numerous, without basal cirri Velia Hum 



D. Radial canals numerous, in to 32 or more; tentacles numerous, without basal cirri Orchietoma 



LAODICEA Lesson | 1843), 



Laodicea calcarata A. Agaesiz. Text cut. 



laodicea calcarata A. Agassi/., in L. Agassiz, Contributions 



Natural History United States, Vol. IV. 1862, p. 350. 

 Lafata calcarata A. Agassiz, North American Acalephas, 1865, 



p. 122. 

 Laodicea calcarata Haeckel, System der Medusen, lsTy, p. ]:n. 



Bell broad, low dome-shaped, about twice as 

 broad as high. Marginal tentacles very numerous 

 ami with swollen bases; interspersed with them are 

 numerous tentacular spurs ami cirri. Radial canals 

 4, along which the gonads are disposed in undulating 

 masses. Manubrium rather short, with 4 plaited 

 oral lobes. Velum well developed. Ocelli black 

 pigment spots on bases of tentacles. 



Ontogeny. — This medusa is derived from the 

 hydroid stock 'if Lafoea calcarata. When first 

 liberated it has hut L' tentacles, has a high, miter- 

 shaped bell, and bears little resemblance to the 

 adult. Growth seems to be rapid, other tentacles 

 appear in rapid succession, and the bell gradually 

 loses its earlier form and assumes the typical shape 

 of the adult, with the various cirri, clubs, etc. 



Colors. — Bell transparent; ovaries dull yellowish 

 to brown: tentacles of similar color near the base, 

 ocelli black. 



[tixiriliiitioii. ---( .'iiiiiiiniii throughout the region; 

 usually taken in considerable numbers in the tow at Wood 



Laodicea calcarata. After A. Agassiz 



Hole during July and August. 



Staurostoma laciniata. After L. Agassiz. 



within the complicated folds just mentioned. 



the tentacles, more prominent on young specimens. 



STAUROSTOMA Haeckel (1879). 

 Staurostoma laciniata (L. Agassiz). Text cut. 



Slaurophora laciniata L. Agassiz, Memoirs American Academy 

 Arts ;m ,i sciences. Vol. IV, 1S49, p. 300; Contributions 

 Natural History United states, Vol. IV, 1862, p. 351. 

 A. Agassiz, North American Acalephae, 1865, p. 136. 



Staurostoma laciniata Haeckel, System iter Mednsen, 1M79, p. 130, 



Bell low dome-shaped, about twice as broad as 

 high, adult specimens attaining a diameter of 150 mm 

 or more, the average, however, only about, 40 to 50 

 mm. Marginal tentacles very numerous; velum thin 

 and delicate; manubrium indistinguishable, mouth 

 early confluent with the genital folds, which are 

 double along the ventral aspect, of each radial canal, 

 and are variously folded or crinkled; gonads develop 

 Ocelli present as violet pigment spots on the bases of 



