THE CLASSIFICATION OF THE OPHIDIA. 213 



In Crotalophorus the heraipenis is finely flounced, as in Ancistroclon, adding- this 

 point of resemblance to the possession of similar head-shields. In Crotalus the organ 

 is strongly calyculate, the lower rows becoming flounces in 0. basiliscus and C. con- 

 fluenlus, but not in G. horridus, C. durissus nor C molossus. My statement that the 

 spines are not ossified in the C. durissus was due to the fact that I examined a specimen 

 not fully grown, although it was not a very small one. It is represented on PI. 

 XXXIII, Pig. 11. 



EXPLANATION OF PLATES. 



The figures, excepting Fig. 9 of PI. XXIV, represent the hemipenis of a side split open so as to show the 

 structures that are exhibited by the entire circumference. Each figure is therefore twice as wide as the organ in 

 its normal condition. Where the organ is bifurcate, one branch only is split, the other being represented as iuvag- 

 inated, and with a portion of the retractor muscle continuous with its apex. The letters on the plates have the 

 following significance : 



Ss, sulcus spermaticus ; cl, calyculi or ruches ; /, flounces ; sp, spines ; spl, spinules ; bh, basal hook ; p, 

 papilla: ; I, laminae. 



Plate XIV 



Hemipknes of Different Types. 

 llysia scytale L., Brazil. X 3. 

 Epicrates angulifer D. & B., Cuba. X §. 

 Charina bottce Blv., Oregon. X 3. 

 Holarchus ancorus Gird., Philippine Ids. X 2. 

 Oligodon subquadratus D. & B., Java. X 3. 

 Bascanium constrictor L., N. America, x 2. 

 Opheomorphus alticolus Cope, Peru. X 3. 

 Natrix fasciata sipedonL., N. America. X 3. 

 Naja haje L. melanoleuca Hall., W. Africa. X 2. 

 Bitis arietans L., S. Africa. X 2. 

 Crotalus confluentus Say, Texas. X 2. 



Plate XV 



Pebopoda, Achochoedid^:, Calamarin^b. 

 Boa constrictor L., Brazil. X f- 

 Eunectes murinus L., Brazil. X f. 

 Ohilobothrus striatus Fisch., Hayti. X 2. 

 Enygrus bibronii D. & B., Fejee Ids. X 2. 

 Liahanura trivirgata Cope, Low. California. X 2. 

 Eryx jaculiis L., W. Asia. X 3. 

 Python spilotes Lacep., Australia, x 3. 

 Ungualia melanura D. & B., Cuba. X 4. 

 Galamaria gervaisii D. & B., Philippine Ids. X 6. 



