U N I . 



Plate LXXXVI. 



Species 457. (Mus. Hanley.) 



Unio pellis-lacerti. Un. testa pared, crassfi, ven/ri- 

 cosd, oblongd vet elongaio-ohlongd, m/Bqidlaternli, pos- 

 tice angulatd, smpius in/erne retusd, tuteo-olivaced, 

 p/icis oUvaceo-virentibns angulatim divergeiitibus itn- 

 dique munitd ; plicis aide cosiam umhonalem angu- 

 latam remotiorihm et majorihiis, margar'dd alho-ar- 

 gfiifed ; dejdibus cardhiatibiisrude lacbiialis, in utrd- 

 qiie valvuld 2, dente centrali magiio siibtrigouo ; la- 

 uiettis lateralibus productis, curvatis, postice valdi' ob- 

 lique granoso-sidcatis. 



The lizakd's-skin Unio. Shell small, thick, ventricose, 

 oblong, or elongated-oblong, iueqnilateral, posteriorly 

 angular, usually retuse at the lower edge, yellowish 

 olive, everywhere strengthened with dark green olive 

 angularly divergent folds, which are larger and more 

 distant before the angulated umbonal ridge ; nacre 

 silvery white ; two coarsely jagged primary teeth in 

 each valve, the central one large and subtriangular ; 

 lateral lamellas produced, curved, very obliquely gra- 

 nosely sulcated posteriorly. 



MoRELET, Journ. Conch. 1865. p. 22. 

 U. crifspatiis ? Gould. 

 U. scohiiudii.'< ? Lea. 



Ilah. Siam. 

 The description of Morelet alone suits this appositely 



named shell ; yet it is probable that both the American 



writers intended to indicate it. The hinge is variable 



(sometimes crested), and peculiar. 



Species 458. (Mus. Hanley.) 

 Unio reticulatus. Un. testa tumidd, cmssd, inaquda- 

 te/v/i, obovato-qnadraid, posiice sMiangntatd, oli- 

 vaceo-hrunned concolore, Itevigatd ; margine veutndi 

 coiwexo et antice acclivi ; casta umbotiali rotundatd 

 sntixque coiispicnd, ligamento peramjusto vixqne pro- 

 miiiido, tiniiild i/idld, ami dorsali posticd siii/plice ; 

 Hiuboinbns satis cmiiienlibiis recurvatis (i. e. antrorsum 

 inclinatis), margaritd albo-argetded ; deidibus latera- 

 libus nulUs ; deidibus eardinalihus latis, trigonis, 

 mag ids. 

 The network Unio. Shell swollen, thick, inequilateral, 

 squarish-oboval, subbiangulated behind, of a uniform 

 brown olive, smooth ; ventral edge convex, rising in 

 front ; umbonal ridge rounded and tolerably conspi- 



cuous, ligament very nan-ow and scarcely at all pro- 

 jecting, no lunule, dorsal hinder area simple, umboes 

 tolerably prominent, recurved (/. e. inclining forwards), 

 nacre silvery white, no lateral teeth ; primary teeth 

 big, broad, triangidar. 

 MoEiCAND (= Moiwcoiidi/lni ?), Eev.'et Mag. Zool. ls.58. 

 pi. 15. f. 2. 

 Alasmodoida Schoiidmrgki, Hanley, MSS. 

 Hab. British Guiana (Schomburgk) ; Brazil (Moricand). 



Tiie shell here represented comes close to Punigiuig- 

 aiiiis, but differs entirely from D'Orbigny's type specimen. 

 It is somewhat less elongated than the specimen deline- 

 ated by Moricand, and has rather different teeth. The 

 umbonal cavity extends far beneath the broad hinge-mar- 

 gin, which latter, besides a huge triangular tooth, bears 

 likewise a second rudimentary one in each valve. 



Species 459. (Mus. Hanley.) 

 Unio TEIGONUS. Un. testd hand mngnd, solidd, titmidd, 

 siibtrigond, antice brevi et sublruncatd, postice attenn- 

 alim subbianifidald et minus inflatd, olivaccd concolore. 

 sublrevigatd ; margine ventrali antice arcuato, posiice 

 retnso ; costd unibonali angulatd, htnuld n/agnd, nni- 

 honibus eminentibus, margaritd alba ; dentibus cardi- 

 nalibuspermagnis, trigonis, valde laciniatis ; In Mel lis 

 posticis lo/igis. 

 The triangular Unio. Shell not large, solid, tumid, 

 subtriangular, short and subtruncated in front, 

 less swollen tapering and subbiangulated behind, 

 olive, not variegated, almost smooth ; ventral edge 

 arched in front, retuse behind, umbonal ridge angu- 

 lar, lunule large, umboes prominent, nacre white ; 

 primary teeth very big, triangnlar, much jagged ; 

 posterior lamelhe elongated. 

 Lea, Obs. on Unio (Trans. Amer. Phil. Soc. vol. iv.), vol. 

 i. p. 120. pi. 16. f 40. 

 U. undatns, Barnes (probably). 

 Hab. Ohio, N. America. 



This is not the shell eiToneously so termed in Plate 

 LXIV., but one kindly named by Lea himself What- 

 ever may be thought of the species with which he has in- 

 undated science during the last ten years, his great cour- 

 tesy and extreme liberality are universally appreciated. 



September. 1868. 



