216 MOLLUSCA. 
c. varicosus: paullo magis ventricosus ; long. 36-37, diam. 16-18, apert. 17-19 millim. (Figg. 16, 16 a, 6.) 
Bulimus varicosus, Pfr. P. Z. S. 1851, p. 256"; in Martini & Chemnitz, Syst. Conch.-Cab. ed. 2, 
Bulimus, p. 83, t. 80. figg. 7, 8'*; Monogr. Helic. Vivent. iii. p. 326". 
Bulimus kefersteini, var. 8, Pfr. Novit. Conch. iii. t. 76. fig. 9°. 
Hab. E. Mexico: Vera Cruz (coll. Cuming’); Orizaba (Boucard °, Botteri™® 1°) ; 
Cordova, commonly, on orange-trees (Hége", Berendt®!°); Atoyac (H. H. Smith) ; 
Mirador (Sartorius). 
Mexico, without nearer indication of locality °~”. 
d. puttzert : leviter striatulus et lineolibus spiralibus subtilissimis vix conspicuis, flavidus nitidulus, strigis fuscis 
inter se remotis, subundulatis, continuis. 
Long. 30, diam. 13, apert. long. 15, diam. 8 millim. (Tab. XVI. fig. 1.) 
Bulimus attenuatus, Angas, P. Z. 8, 1879, p. 478”. 
Hab. S.W. Costa Rica: Alto de Mano Tigre, near Terraba, 690 metres above the sea 
(Pittier). 
CentraL Costa Rica: Dota, a high hill-region, south of San José (Gadd 38). 
The white variety has been found in company with typically-coloured specimens at 
Atoyac (H. H. Smith) and Orizaba (Bottert). 
The brown stripes are nearly perpendicular, often interrupted near the suture, and 
ordinarily less numerous in the last whorl than in the preceding ones ; in some speci- 
mens they are entirely wanting in the last whorl, these forming a transition to the white 
variety. In a few specimens the stripes become broader and look rather like those of 
O. serperastrum, var. paivanus ; but the shell is easily to be distinguished from that of 
O. serperastrum by its more attenuated shape and the much thinner, conspicuously 
spirally twisted columella. The apex of the shell and the inside of the aperture are 
in some specimens yellowish. 
The var. pittzer?, from Costa Rica, differs in the shell being smoother and rather 
yellowish, the streaks not interrupted; it has the aperture formed exactly as in typical 
attenuatus. 
Nearly allied to this species is 0. fusoides, d’Orb., from Quito; but the latter has a 
still more slender, turrite form, a proportionately shorter aperture, and the stripes 
more regularly equidistant and mostly forked upwards. 
23. Otostomus trimarianus, sp.n. (Tab. XIII. fig. 17.) 
Testa rimato-perforata, ovato-fusiformis, tenuiuscula, leviter striatula, nitidula, alba; subinde fragmentis 
fasciarum interruptarum picta ; spira attenuata, acutiuscula, apice pallida; anfr. 7, convexiusculi, sutura 
impressa, subtiliter et irregulariter crenulata, ultimus basi modice attenuatus ; apertura dimidia longi- 
tudine totius teste brevior, subperpendicularis, ovali-oblonga, peristomate crassiusculo, breviter expanso, 
albo, margine columellari subrecto, crassiusculo, reflexo, perforationem semitegente. 
Long. 32, diam. 14, aperture long. 144, apert. diam. 7 millim. 
” 27 ” 12 ” ” 123 or) ” 7 ” 
Hab. N.W. Mexico: Tres Marias Islands (Forrer and Richardson). 
