CYCLOTIIONE ACCLINIDENS. 247 



another question, yet one to which differences in the positions of the teeth 

 in various individuals suggest an aflirmative answer. On tlie specimens of 

 C acdimdcns no such motion is observable; pressed in one direction or the 

 other they break before moving. The maxillary teeth of C. si(jnata are 

 shorter, more numerous and more erect than those of C. acciinidens. 



station. Latitude. Longitude. Depth. Temperature. Bottom. 



3382 6° 21' N. 80° 41' \V. 1793 lUtlioms 30.8° 1<". On. M. 



Cyclothone acciinidens sp. n. 

 Flate J, fy. 4. 



Br. r. 14 ; D. 14 ; A. 18-20 ; V. 7 ; P. 10. 



Although this form is very much like Cjjdothone microdon it is readily 

 distinguished by dififorences of dentition. Body slender, compres.sed, 

 moderately long. Haad narro-w, about one fifth of the total length, pointed 

 at the snout. Eye small, nearly half as long as the snout, one eighth of 

 the length of the head. Snout short, narrow, sharp at the tip. Mouth 

 large, more than four times as long as the snout; intermaxilJaries short, 

 hardly one fifth as long as the maxillaries ; maxillaries forming a broad 

 curve down and backward, thin, rather narrow, furnished with teeth along 

 the entire lower edge ; lower jaws much stronger backward, imiting in a 

 sharp point at the .symphysis. A low prominence or angle above the upper 

 jaws, at each side of tlie top of the snout. All of the teeth are slender 

 acicular, very sharp, more or le.ss bent and have striae passing obli(iuely 

 toward the point and to the concave side of the teeth ; intermaxillary 

 teeth six to eight, smaller, less slender; maxillary teeth about fifty-two, 

 very small forward, nearly vertical in the anterior third of the length, 

 gradually becoming much larger backward, more or le.ss closely inclined 

 forward toward the jaw, slightly bent outward near the points. Though 

 the inclined teeth only number about half as many as the vertical they 

 occupy about two thirds of the length of the jaw. One or two of the hind- 

 most teeth are smaller and nearly vertical. Vomerine teeth about four in 

 a short series at each side slightly convergent forward. Palatine teeth in 

 a group near the front ends of the bones. Branchiostegal rays fourteen 

 to thirteen. On each side there are thirteen luminous organs in the bran- 

 chiostegal series, sixteen between the isthmus and the anal, and sixteen 



