436 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



great, and they do not meet in the central axis. The lips, which are 

 simple in Turritopsis, are bifurcated. 



Haeckel has described, from the Canary Islands, and figured in his 

 "System der medusae," a medusa, Callitiara polyophthalma, for which 

 he has established the genus Callitiara. It is very close to Turritopsis, 

 as Haeckel points out, differing from it in little except the presence 

 of a second ocellus on the exumbral side of the bulb of each tentacle, 

 in addition to the one that is situated on the velar side in Turritopsis 

 and its allies. Its endodermal peduncle is less developed than it is 

 in Turritopsis. Its lips are simple as in Turritopsis. 



The genus Modeeria was established by Forbes for a medusa, 

 Modeeria fonnosa, with four tentacles, without a peduncle, and with 

 the gonads simple and perradial ; and it is so treated by Haeckel in his 

 "System der medusae." It seems, therefore, to be a most inappro- 

 priate name for a Turritopsis-like medusa; and it should be restricted 

 to Modeeria fonnom of Forbes and its natural allies; while the Tur- 

 ritopsis-like medusae, which have no affinity with Modeeria of Forbes, 

 form a natural genus which should be closely associated, in the system 

 of the medusae, with Turritopsis and Callitiara. Haeckel, who puts 

 Turritopsis and Callitiara together in his "System" while he puts the 

 genus Modeeria of Forbes in another family, thus exhibits a sound in- 

 sight into the question that is here at issue. 



We take this occasion to call to the attention of those who may under- 

 take the systematic revision of these medusae to the fact that allies 

 of Turritopsis, which have nothing in common with Modeeria of 

 Forbes, except so far as they are hydroid jelly-fishes, have been wrongly 

 referred to this genus, while they constitute another natural genus. 



We suggest, to those who may revise the subject, the propriety of 

 establishing a genus for these medusae, to which the name, Mocradia, 

 might well be given in honor of John McCrady, the discoverer of 

 Turritopsis. 



If this suggestion be accepted, three genera of Turritopsis-like 

 medusae should be recognized. The three genera are characterized 

 as follows: 



TURRITOPSIS: Tentacles numerous, in two alternating rows in 

 young medusae, in one row in adults, with a single ocellus on the 

 velar side of each tentacular bulb; oral lips four, simple; perradial 

 gonads split on perradii, and fused on interradii; endodermal peduncle 

 nearly solid. 



