AXTHOMKIM S.K --< HIAHKI.I.A. 



183 



The stomach is barrel-shaped and about one-fifth as wide as the bell-diameter. It is 

 not quite halt as long as the depth of the bell-cavity and is mounted upon a very short peduncle 

 down which the 4 radial-canals extend to the base of the stomach. There are 4 railiulh 

 placed clusters ot oral tentacles. Each cluster arises from a single stalk which branches 

 dichotomously 5 to 6 times, thus giving somewhat more than 32 terminal ramuli in each 



quadrant. These terminal branches end in nematocyst- 

 knobs. 



The gonads are 8 ad radial, linear swellings along the 

 sides ot the barrel-shaped stomach. 



The entoderm ot the radial-canals and tentacle-bulbs 

 is rose-red, as is also the deep-lying entoderm of the 

 stomach. The gonads are dark-carmine and the ocelli 

 dark-blown. 



Found in the (>ulf of California. Pacific coast of 

 Mexico, by the Albatross in the spring ot iSui. 



Subfamily DENDROSTAURIN^, nov. subfam. 



li '.thiilm' his ll'iUiail-ri MAAS, 1904, Sitzungsbcr. math.-plivs. K|.ISM- kgl. 

 Baver. Akad. Wissenschaft., Bit. 34, pp. 437, 458; Crjspeduten MI-I|UM-II 

 der tibogti Expedition, Monog. 10, pp. 15, 19. Bigeluvs, nio<;, Mem. 

 Mus. Cninp. Zool. at Harvard College, vol. 37, p. 212. 



C.tinnrjliil.e (in part), HAI:CKK|-, 187*), Syst. der Medusen, p. 140. 



EH,. f)d.- -Clnnrella centripetalis, after M.I.I , 

 in Mem. Museum Comp. Zoo], 

 at Harvard College. 



SUBFAMILY CHARACTERS. 



Dendrostaunnae: Anthomedusae with 4 or more pri- 

 mary radial-canals, some or all ot which branch. The 

 4 lips are without oral tentacles. The gonads are upon the interradial, or adradial, sides of 

 the stomach. 



There are two tribes, Bythotiaridi and Williadi. 



The tribe Bythotiaridi was established by Maas, 1904, as the family Bythotiaridae (Sit 

 /ungsber. inatli.-phys. Klasse kgl. Bayer. Akad. Wissenschaft., Bd. 34, p. 437; also, Cias- 

 pedoten Medusen der Si/won Expedition, Monog. 10, p. 15). Maas pointed out its relation- 

 ship to the Tiannae, which are exhibited most completely in the genus Bythotiara Ciiinther, 

 wherein the gonads are exactly similar to those ot the Tiarm;i', the only essential difference 

 being the branched radial-canals. 



The tribe Williadi as we define it is equivalent to the family Williadae of Forbes, Agassiz, 

 Haeckel, Browne, Maas, and others. 



In 1904, lor. fit., Maas showed that the Cannotidae of I laeckel, 1879, was a heterogeneous 

 group composed ot both Anthomedusae and Leptomedusx, and is, therefore, purely artificial 

 and must be abandoned. 



\\ e will now proceed to define the tribes Bythotiaridi and Williadi and their enera. 



CHARACTERS ()! THE TRINE HYTHOTI ARUM. 



Dendrostaurinx with branching radial-canals and a ring-canal. Without clusters of 

 nematocysts upon the exumhrella above the margin between the tentacles. With hollow ten- 

 tacles situated at the ends of the branches ot the radial-Canals. The <mnads are confined to 

 the inteiradial sides of the stomach. 



1 he Bythotiaridi are separated trom the \\ illiadi by the presence ot a ring-canal and tin- 

 absence of clusters of nematocysts upon the exumbrella. 



In the genera Bythotiara and Sihogitii the gonads are similar to those of the Amphine- 

 midi and I'and*idi of the Tiarinae, for they consist of ridges in the ectodeim of the inteiradial 

 sides of the stomach. Unfortunately the development ot these medusz is unknown, although 

 a peculiar process ot budding takes place in the tentacle-bulbs ol Niobia and the same medusa 

 is known to cast its eggs out into the water. 



The genera of the tribe Bythotiaridi are as follows: Bythotiara Giimher, 1903; with 4 

 radial-canals which bifurcate so that 8 canals reach the circular vessel. S marginal tentacles, 



