256 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



II 



So 1 



aasa 



a B a a a a 





'ZKttK'Z, 



says: "Collerette relativ kurz, nur bis etwa 

 zur halben Corona reichend." The speci- 

 mens collected during the Philippine expedi- 

 tion agree with Ritter-Zahony's statement. 

 Every specimen has a collarette which, 

 while narrow and short, is broader and longer 

 than that of S. bipunctata. Owing to this 

 confusion in the literature, S. ledoti is 

 redescribed from the Philippine speci- 

 mens: 



Collarette (pi. 38, fig. 30) conspicuous but 

 short, extending caudally a distance nearly 

 equal to greatest width of body. Head 

 small. Lateral fields large. Muscles strong, 

 but narrow. Body firm, retaining its form 

 well, widest slightly behind its middle, and 

 tapering gradually toward head and more 

 rapidly toward tail. No constriction at 

 tail-septum. Tail 20 to 30 per cent of total 

 length of animal. Corona ciliata not ob- 

 served. 



Anterior fins (pi. 35, fig. 6) longer and 

 narrower than posterior fins, without rays 

 in the anterior half or two- thirds. Fins 

 extend nearly if not quite to posterior end 

 of ventral ganglion, the exact limit being 

 difficult to determine owing to absence of 

 rays. In some individuals the fins may 

 extend beyond posterior end of ganglion, 

 but never to its anterior end. Form acutely 

 triangular, the position of greatest width 

 being in posterior quarter of fins. 



Posterior fins (pi. 35, fig. 6) extend 

 caudally to seminal vesicles. Rays absent 

 in anterior extremity. Usually, but not 

 always, less than 50 per cent of fin in 

 front of tail-septum, the extremes being 

 40 and 52 per cent. Triangular in form, 

 the position of greatest width behi'j; behind 

 tail-septum. Interval from anterior to 

 posterior fins varies from hah' to twice the 

 maximum width of body. 



Vestibular ridge (pi. 37, fig. 2o)- promi- 

 nent and provided with regular and un- 

 usually acute papillae. Number of papillae 



