TIIK UArUACUIA OF NolMIl AMKIUCA. 



77 



^'U 



i 



onfiri'l.v, tlio Rroiiiid ; miUMiiis ,.ort's, as in tlio lasl ; lu'll.v with a median 

 (laiii or ItlacU l>aii(l; sumctinH's tin* yellow is sJiadiMl '.vitli olive: Nos. 

 Hii;{, no.'), .{!»!»(», I7(»;5, WM to Kl!»!l, ;;!r»r», lOlS, 407!>, KMKJ, ;J!»82, 53r)9, 

 •lOSJ, ;;!>1M. No. HL'O iiii;;iit he assij^iied to either (i or ;'. 



()' (ii'oiiiid olive, with iiiiinei'oiis small hiowii spots; otherwise na 

 altoNc; No. UW>, and the t.vi»e ol'.l. iiiiwiiUthim. 



I- Urowii al)ove, yellowish helow, otherwise as above; .'{U.St/>, -4702, 

 3902, .'{!).■>.■)/;, t'roiii most diverse loi;alities. 



1' Color as in r, the yellow leaving; only inosculatin}; linos of brown; 

 no frontal, nasal, oi' mandibular series of mneoiis pores; on*' specimen, 

 No. i(H)S. 



So much as to theprineiple of ornamental variation. The followitiff are 

 the tbrnis resnltin;;' IVom unetpial development of parts. The rea<ler will 

 observe by the numbers how little they eoiiieide with each other and 

 with the precediii;;. 



Ti/i)c A. — Palatine teetii in a j^entle arch, convex (brwards, not extentl- 

 in;; between nares; the teeth (l»iit not the rid;;e) interrupted inside the 

 series behin<l the nares. No>. I'.tos and .").">iji» (J s|»ecimens); in all re- 

 spects fully ^rowM. the former nut more than half the size of the usual 

 ty|»e. Approacli distantly .1. Irisnijitinii Cope. 



7'V/R' />. — Palatine teeth tormin;; a strai;;ht seiies on each side, meet- 

 ing at a more or less (»pen unfile between tln' nares. Most ()f the speci- 

 mens; Nos. ITOL'. ;;y!L'. iTtr.. i(;i;{, khm, loio. kids, .'jiMio. no.}, -lom, 



to t(l!M>, lOSl. ;;<):».-). |(>7!>. <)f lliese, the an-ile of the tooth series 

 «loes not extend beyond liie anteiior mar;;in of the nares in twenty- 

 six si)ecimens. of which one exhiltits a small, undeveloped ton^^ue, and 

 none have the stumps j)f the braiichia' reiiiainin;:;. In eleven specimens 

 the an;;le extends beyond this point (in ."»'.»!)(), and another approaching; 

 anarch in Ioimii, :ind ol these the inn.uue is small and larval in six, 

 and inon*> of thcNC stumpsuf the luaiicliiM' remain; this last is of medium 

 Hize only, but Nos. UW, and 'M>\)\ arc lar;;e, the lirs very huj-e; they add 

 the larval character of a slnnt, det p t:iil. It is to i»e noted that the.so 

 Bja'cinu'us art' from Minnesota and the holders of Ibitish America — re- 

 jjions subject to ;;reat cold — to which ( ause we may with much proba- 

 bility assi^iu their characters. Two individuals lu'esentin;; the same 

 IH'culiaiities are desciil»ed under the hea<l of .1. tiifiiniini. 



Of two speeinu'iis from Chihuahua, fully developed, the teeth are of 

 the two types; of ei;,'ht fr(»m Calitbrnia, one presents the second type 

 oidy; it is otherwise fully developed. 



Tjipc C. — riie postnarial portion of the i)alatiue series has nearly or 

 quite assumed its transverse position, while the median series remains 

 in its larval arch, extendin;; more or less in advance of the nares. 

 K\'^\\\ specitnens, tour of the larji'est size; .".!».V>«, t07S, KML', K>S4; two 

 Mu.seum of IMiiladelphia Acaih'my, one type of .1. Hnfc»/f(/Hm Hall. Of 

 these, two have the small tonyue and traces of branchiae while four are 

 fidly develoiied in these ii'spects. 



|! 





th 



