109 



This species is also represented by wholes or parts of from sevent}' to 

 eighty vertebrae, with numerous neural and liaemal spines and fin-radii, and, 

 perhaps, some ribs. There are no teeth nor cranial fraa:mcnts. The l)iilk 

 of the vertebrae is double that of those of Daptimis phhhotomus. 



The vertebras present the usual two inferior, two lateral, and two supe- 

 rior grooves — the last for the neural arch. There are no cervical vertebrae; 

 for these characters show them all to be dorsals and caudals. The suture for 

 the ueurapophyses forms a regular angulatc convexity projecting downward. 

 The arch is not closed above anteriorly, and is expanded laterally, while the 

 spine is directed very obliquely backward. The concavities of the articular 

 extremities are equal in the dorsals ; but, in the caudals, one surface is much 

 more deeply concave than the other, one being funnel-shaped, and the other 

 nearly plane in a few. 



A number of consecutive vertebrae which represent the posterior portion 

 of the caudal series are preserved One of these is fortunately the very 

 extremity; and they demonstrate the tail to have been vertebrated or hetero- 

 cercal, after the manner of Salmo. On the anterior three of the series, the 

 lateral grooves have disappeared from the centra ; the neural canal is very 

 small, and the spines are very massive and curved backward, but much less 

 so tlian in the more posterior parts of the column; they are flattened, wider 

 than deep, and in close contact with each other, except the anterior of the 

 three, which presents a narrowed edge forward. The ha^mapophyses are 

 Ihin, and suturally united to the centrum by a flat gomphosis. The terminal 

 series eml)r;ices six vertebrae, which have a minute or obsolete nrural canal, 

 l)ut haemal canal distinct, but apparently interrupted. The haemal arches are 

 united to tlie centra by a rather smooth suture. The general direction of these 

 vertebrae forms a light upward curve. The haemal spines are flat and laminar, 

 and their margins in contact; they decrease in width and length to the end 

 of the series. The neural spine lies obliquely backward, and has a narrowed 

 anterior ridge, but stout shaft. 



The anterior haemal spine in place exhibits a subglobular base, like an 

 articulation, and its shaft is wider than those posterior to it. It is a subtri- 

 angular flat bone, with neck and subglobular extremity, which applies very 

 well to a concavity l)etween the anterior pair of pleurapophyscs, but does not 

 in that position preserve contact witli the aiitc'ior margin of the succeeding 

 spine. One margin of the enigmatical bone is thin and divergent; tlie other 



