48 



first dorsal spine; it is separated from the caudal 

 fin by a space equal to it own height. 



Tl e anal fin, coterminal with the dorsal re- 

 sent it in form, but is shorter, aris ng abou^ 

 opposite the fourth ray; tispi ceded bj ashort 





: • - r - ,ia ! s r" 



Gjh rratus is very closely allied to G Cwmn, 

 though the one has the side entirely plated the 

 other has il partially naked : it is m fact chiefly 

 bv this character tiiat the two are separated.- - 

 The affinity to G. Dekayi is less striking, though 

 are plated ; the surface of the lateral plates, 

 the form of the caudal carina, the structure ol 



: n„,v than I the ventral spines &C are quite sufficient to dis- 



the dorsal spi - matures 



conspic?o«J «*J 



superior. Thesoftraj ed m tl 



m 



Lwtf the spine which l™* 



?ht. . 'ii ,,-,, .. 



iorah, narrow aud ru 

 height ah the depth ol the oo . . 



|). 2. L-ll : A. 1-9: \ . 1-i : 1 ■ l" • • • l - 

 with six or , 



Cotor grayish br 

 and beneath; a blackish band al 



t'lil 



The existence of two ■ 

 lerior to 



tcteraino «™»« 



u to prevail in quil ; J» 



: .„„. VVchave ail' = ' . "P* 



ciesol this type, thin nth 



On ' M-- ' frnm 



I. GaSTEROSTEUS B1.YCUI.KATKS. Ml 



New York. .... 



Dek wi. Ayi ■ 

 one' described by Dr. Dekaj as G 



suppSgitl ' ^Jf 



cfes; as this however is undoul 



- I to name ; , 

 I ,, . i , rs Ci-vikbi, Uirard; s»l> 



Krardtobeth I "J " 



spec.ni 

 Joined •„, N wfouudland. and (,inu 

 those h •• 



[wJared >.«•« thai - - •>*■ 



land form is ; I " ■"• ■' ... u 



son's Pass. ' 



5. | 



Lake, » 'ah 



6. c ■ ' ,l '- 



3C4i Bay, ' 



7.. G WKKo.-TXi- rSOPIN •• I i S, III 



Lake near San Franc 



aATCs, Aj 



- m From ' 



ot 

 in its whole i 



dorsal spin,-. 



iin. 



'V'"- , , , .1 r>,,- 



G » i'id(i« is found in the marshes ol the Baj 

 of San Francisco, but is apparently not common. 

 Dr. W. P. Gibbons presented the following 

 description of a new species of nab. which had 

 - ' '■■ :i -' ; - 

 Ctenorihntjs — Gibbons. 



i ate tuberculous, antero- 

 mlrtjins toothed, retroii 



• of extra 

 L conical triangular, with ds upper surtace 

 . ,;, e, Jhorte. 



tlian the rostrum, with the superior surfacespi- 



q ., ,, v . vS i ... Gibbous, 

 ranulate tubei 

 [ margins tooth ""£ 



. Abouteighl pr on h 



Sntero- lateral margins, withoul ^cludingthe 



adjoining exterior ones I. 

 two lateral ones . mpenor ow ahuifcr , 



!inferior ,,,, . curving ^arfsand 



projecting beyond tl ^tero-p^terior 



with I'rom 8 to 12 princ 

 ji; as this however is undoubtedly inmrrecl H m "g ol 



S,e wSouepri. 



11 anu.dape^anotnera, l nM->7'- i --'; i : i ;'; i 

 tyof the noddle third; two more axgc ones on 



tne trans> wn '» , '". m °* ^ 



.ere and 4 or 5 ha* ot ttt 



,,. The surface. trapace .* thn 



rendered exceedingly uneven. 



Basilar plate ol the external ante una with a 

 t00 th on the outside. Second segment scalloped, 

 or border terminating in a stout spine, hav- 

 ing a tooth al the base, on the limi 



.... i ..I.. <i 



pior lion lei 





,11 I .11 I ". ■ . 



or ; creuulate spines, mho. 



■bit. ' ':v M - 



f upper si - '", 



„!,' angles peel mate. Promt "' 



tneutthe antenna arises havm.4 

 laal polnl with about 30 articula 

 - beyond lb 

 I 



articui, r 'T. 



.ipi.al groove is midway on tl.. 

 superior surface of the baatd joint, 

 gcular pednneles a PF °ximate, shorter thaj 

 mcrol the rostrum, eclnnal uppej 



,,, Firs! joint ol external I 



