232 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



ineuces just below the brancbise and extends along tbe side of the ab- 

 domen parallel with the superior band, to nearly opposite the vent. In 

 some specimens a similar band extends from the vent along the me- 

 dian line below to the end of the tail, bat this is frequently wanting- 

 More frequently the dermal keel and border on the superior edge of the 

 tail is yellow, and this color is sometimes prolonged on the median line 

 of the back for the posterior half or more of its length. The belly has 

 rather large, more or less longitudinal yellow spots ; and the ground 

 color between the lateral bands is similarly but less coarsely spotted, 

 except on the tail, where the spots are dense. The fore limbs are yel- 

 low, with a brown tiuge. 



The branchiiE of this species display partial or entire abortion in a 

 larger proportion of individuals than in the Siren lacertina. An epi- 

 dermal sheath may inclose the fibrillse on the external side only, or on 

 the external and internal sides. In ten specimens five have the epi- 

 dermal covering on both sides, three have the fibrillae free at the lower 

 edge of the branchia, and in two the fimbriae are free on the entire pos- 

 terior face. Sometimes the first branchia is inclosed in a distinct sheath 

 from the other two, and sometimes all are distinct. The insheathing 

 membrane may be continuous at the inferior edge of the branchia with 

 the epidermis of the throat. In this case a small fissure remains, cor- 

 responding with the one on the pharyngeal wall. 



This species is so far only known from Georgia and Florida. -From 

 the latter State I have received it from Volusia. 



Psendobranchus striatus Lecoute. 

 EESEEVE SEKIES. 



Catalogue 

 uiimber. 



No. of 

 spec. 



Locality. 



When 

 collected. 



From wboiu received. 



Nature of 

 .specimen. 



7010 



5 

 4 

 1 



10 





1855 

 Feb. 1, 1851 







5051 







Do. 



7020 







Do 













Annra Dum6ril, 1804. 



SALIE]t>rTIA. 



Lanrenti, 1768. 

 OSTEOLOGY. 



Supraoccipital, basioccipital, intercalary^, supratemporal, and post- 

 frontal bones wanting. Frontals and i)arietals connate; prefrontals 

 present; nasals wanting or rudimental. Vomers and palatines pres- 

 ent, distinct from each other, tlie latter inclosing the internal uares and 

 joining the pterygoids. Maxillaries, premaxiliaries, and ethmoid j)res- 

 ent. 



