STOMOTOCA. 201 



fig. 3). These, in surface view, appear to be discontinuous in both per- and 

 interradii, but on sections it is seen that near the base of the manubrium the 

 gonad tissue is continuous across the interradial areas (PI. 44, fig. 4). At 

 this stage, then, the gonads, being horseshoe-shaped, correspond to those of 

 Pandea and Tiara. They already show definite transverse folds ; and in the 

 adults (PI. 40, fig. 6) these folds are very prominent. The further growth 

 of the gonad is difficult to follow on the few available specimens. Apparently 

 the arms of each horseshoe become attached to the subumbrella surface along 

 the sides of the radial canals, thus forming subdivisions of the bell cavity 

 comparable to those in various Tiaridae ; but in the present case the division 

 is apparently caused by outgrowths of the walls of the manubrium, and not 

 by dilations of the radial canals such as Vanhoffen ('89) has shown to be the 

 true nature of the " mesenteries" described by Haeckel ('79). 



Color. — In life (PI. 40, fig. 6) the manubrium, gonads, and two primary 

 tentacles are salmon red, each of the latter with a deeper band along its 

 inner surface. The ocelli are claret red. 



So far as I have been able to learn, the only other species of Amphi- 

 nemidae in which a type of gonad similar to that in A. turrida has been 

 described is the A. octaedrus of Haeckel, though the same condition occurs, 

 according to Brooks (: 03), in the genus Dichotomia. Unfortunately Haeckel 

 has not figured A. octaedrus, but as far as one can determine from his very 

 brief description it is certainly very closely allied to A. turrida, from which 

 it is separated by the octohedral form of the bell, and the smaller number 

 (ten) of rudimentary tentacles all of which are apparently of one size. It is 

 very desirable that this species be studied afresh. Meanwhile it seems best 

 to retain both A. octaedrus and A. turrida as distinct species in spite of their 

 close resemblance to each other. A. turrida has been recorded only from 

 the West Indian region, A. octaedrus from the European coast. 



Stomotoca L. Agassiz, 1862. 



Amphinemidae with the stomach situated on a gelatinous peduncle. 



Besides having a peduncle, S. atra A. Agassiz, S. pterophylla Haeckel, 

 and S. divisa Maas are distinguished from the various species of Aniphi- 

 nema by having a much larger number of tentacles. The distinctions be- 

 tween the three species are slight. Maas ('97) himself recognizes the close 

 relationship between S. pterophylla and 8. divisa, but believes a new species 



