Hyatt, j 314 [April 4, 



siphonal saddle are not separable from congeneric forms having 

 undivided ventral lobes. The Primordialidae have very large 

 siphonal saddles carrying short, collarless funnels, and the 

 Magnosellaridae have undivided ventral lobes. The funnels 

 are small and elevated upon the first pair of saddles in 

 most of the Magnosellaridae and these so closely simulate si- 

 phonal saddles as to deceive the most accurate observer. 



Platyclymenia, nobis, includes species with similar sutures to Cyrtoclymenia, but 

 the whorl is discoidal as in the Oxyclymenia and it differs from both of these in hav- 

 ing costated whorls, which are in section sub-quadragonal Platy. annulata, ibid, pi. 15, 

 fig. 11, and includes, also pi. 18, fig. 12, spioosa, pi. 16, fig. 1, and binodosa, pi. 19, fig. 

 1, though the latter has an internal lateral saddle. 



CYMACLYMENIDAE. 



The forms have undivided ventral saddles, and two pairs of lateral lobes, the first 

 pair angular and the second pair in the umbilicus and rounded. The siphon is transi- 

 tional to the large siphoned species of the next family. 



Cymaclymenia includes species with forms similar to those of Cyrtoclymenia, but 

 more compressed and involute. The sutures have prominant ventral saddles, and two 

 lateral lobes with two umbilical or dorsal lobes on either side of the annular lobe. 

 Type, Cym, striata, ibid, pi. 18, and bilobata, pi. 19. These forms in their siphons 

 and their sutures connect Cyrtoclymenia with the larger siphoned groups, the 

 Nothoclymeniae of Gumbel, which begin with the next genus. 



Sellacymenia includes species with whorls compressed, sub-quadragonal and 

 precisely similar to Platyclymenia but the sutures are similar to those of Cy- 

 maclymenia and the siphon also according to Dr. Gumbel is large and complete. 

 Type, Sel. angulosa, pi. 19. 



GONIOCLYMENIDAE. 



The ventral saddles are divided by median lobes, and by a pair of marginal lateral 

 lobes. There are also two lateral lobes on either side. The siphon is large, and the 

 funnels conical. 



Cryptoclymenia, nobis, includes but one species. This has the form of Cyrtoclymenia 

 and enables us to connect the series of genera having ventral lobes, with this radical 

 genus. The sutures have median lobes dividing the large ventral saddles, and two 

 pairs of lateral lobes. Type, Crypt. Beaumonti ibid, pi. 20, fig. 5. 



Cycloclymetiia includes an extraordinary discoidal species with numerous, slowly 

 growing whorls. The sutures have the ventral saddles divided by median lobes. 



Gonioclymenia includes species with quadragonai whorls, sometimes costated as in 

 Sellaclymenia and Oxyclymenia but they have median ventral lobes, and two pairs of 

 lateral lobes and large siphons. Type, Gonio. speciosa, ibid, pi. 20, and also subarmata 

 and intermedia ibid, pi. 21. The Gon. pessoides V. Bucn, and biimpressus, ibid, Gon. 

 et Clym. pi. 1, probably are true Clymeninae as stated by Gumbel, and may be species 

 of t;his genus. 



Discoclymenia includes Clymenia Haueri, which has sutures very similar to those of 

 the preceding, but the lobes are more numerous, and the annular lobes broad. The 

 whorls are much involved and compressed in the adult with a deep impressed zone. 



