252 
THE Eyes oF TYPHLOTRITON SPELmuUs.* By Cart H. EIGENMANN 
AND W. A. DENNY. 
[Abstract.] 
Typhlotriton was discovered in Rock House Cave, Barrie County, Mo., 
by Mr. F. A. Sampson, in July, 1891. The specimen was described by 
Stejneger in the Proc. U. S. Nat. Mus., Vol. XV, p. 115. This is the only 
mention made of this salamander in literature. 
In the spring of 1897, I visited Rock House Cave and secured a num- 
ber of larvae which Stejneger pronounced the larvae of his Typhlotriton. 
I was informed by Mr. E. A. Schultze, a member of this academy, that he 
had seen this salamander in the underground passage to Blondis Throne 
room in Marble Cave, Mo. 
In September of 1898 I visited this cave and secured four adults and 
three larvae of the Typhlotriton. A large number of larvae were ob- 
tained from Rock House Cave. Those from Rock House Cave had lived 
in the light, but it is scarcely supposable that those from Marble Cave 
had ever been affected by the light. In the caves both larvae and adults 
are found under stones in and out of the water. Occasionally one is seen 
lying on the bottom of a pool. 
In the aquarium the larvae creep into or under anything available. A 
rubber tube seryed as a hiding place. The rubber tube admitting water to 
the acquarium is sometimes occupied by several (at one time seven) during 
a temporary cessation of the flow of water. A wire screen sloping from the 
bottom of the aquarium forms the most popular collecting place of the 
larvae. They collect beneath this, although it is no protection from the 
light. The eye does not protrude in the larva but it does in the adult. It is 
retracted after death, however, so that preserved specimens will not give 
a correct impression of the real condition. 
The following are a series of measurements on the larvae of Typhlo- 
triton. 
- 
Rock House Cave. Rock House Cave. Marble Cave. 
mn. mm. mm, 
DPSCiNtS (lenetihy\ls sos Tete ea ee ee) cence Sue mendes oe eae 88 
SIZGsO FDU alist oe tk 5 cody oa Da Ree ee es ASD xt, ok OE cael ee Od Dances hr, SEM ee 
WBNS LATORGY.Osicnn' ake seta cee eee eee & aos VAD Minky asada qESOlr 1.60 
From optic nerve to front of lens. .......... SOON cas Aes Ad ease LGe: Bae ee aac wet eee eee 
Veritenhdiamoatorics. ison tide ah ibek coe tals Babs 2 Lee Dantas ites tat eos Ne Sevres 1,28 
“Contributions from the Zoélogical Laboratory of the Indiana University, No. 31. 
