THE 
AMERICAN GEOLOGISl". 
Vol. XXV. FEBRUARY, 1900. No. 2 
NEW SPECIES OF CRINOIDS, BLASTOIDS AND 
CYSTOIDS FROM MISSOURI. 
By R. R. Rowley, Louisiana, Mo. 
(Plate II.) 
Codaster (Cryptoschisma?) laeviculus. (nov. sp.) 
Fig. I. Side view of a large specimen with the ambulacra removed, 
showing the hydrospire slits. 
Fig. 2. Side view of a smaller individual. 
Fig. 3. Same view of a very large one. 
Fig. 4. Side view of a large specimen with the tips of the ambulac- 
ra removed. 
Fig. 5. A large specimen with the ventral surface turned a little to- 
ward the observer, sliowing the spiracles. 
General shape of the body, obconical. The three basal 
plates elongate and having a stem-like appearance below. 
Radials long, half the length of the body, excavated rather 
deeply about a third of the way down for the ambulacra. The 
deltoids (interradial plates) visible externally as short ridge? 
near the summit. Ambulacra short and rather broad or petal- 
loid in outline. Four elongate oval spiracles and a similar 
anal opening, around the summit, connect with parallel slits 
beneath the ambulacra. The surface of all the plates orna- 
mented by fine striae parallel with the sutures. Columnar facet 
small and perforation minute. 
This interesting blastoid comes from the very base of the 
Upper Burlington limestone at Louisiana. Mo., associated 
with Schizoblastus sayi, Granatocrinus? magnibasis and Lo- 
bocrinus pyrifomiis. In its broad ambulacra and large spira- 
