629 
Silves t erina new genus 
Type 31Lvesterina parvibranchialis new species. 
Body elongate, well compressed, tapering to long slender 
tail. Head small, compressed. Snout conic. Eye rather small, 
lateral. Mouth cleft moderate, jaws even. Teeth large, simple, 
curved, erect, rather wide set. Tongue free. Row of large 
pores above upper jaw and another row in rather deep groove 
along lower side of mandible, with several posteriorly along 
lower side of head. Front nostril pair of pores in short tube 
at side of snout tip; hind nostril rather large pore close be¬ 
fore eye. Gill opening not larger then pupil of eye, little 
before and close below level of pectoral fin base. Dorsal be¬ 
gins over pectoral base, continuous with small caudal and long 
anal. Pectoral rays very slender, about IB, fin moderate. 
Diagnosis, apparently unique in the family for its very 
small gill opening, with the appearance of a large pore with a 
slightly elevated cutaneous rim. Combined head and body slight¬ 
ly over half length of tail. 
For the late O&ft* Charles F. Silvester, who studied the 
eels of Porto Rico. 
