788 Notes on the Early Larval Stages, etc. [ October, 
molt, after hatching, does not exhibit the strange and suggestive 
antennal and caudal features described by Mr. Faxon, and which 
he has interpreted so ably. 
An Abbreviated Metamorphosis in Alpheus heterochelis.—This 
species and Alpheus minus Say, are very abundant, living in the 
larger excurrent orifices of the large sponges which exist from 
the depth of one or two feet or more to deeper water, at Key 
West, Florida. 4. minus is, however, far more abundant than 
the larger species. I found several of A. heterochelis with fat 
advanced embryo, in the winter of 1869-70, and on removing the 
‘embryonic zoéa from the egg, was interested to find that the larva 
was of aform much more advanced than in the zoéa of other 
Anomoura described and figured by Fritz Miiller in his sugges- 
tive work entitled “ Facts for Darwin.” Indeed the metamorpho- 
sis appears to be abbreviated, and the larva on hatching closely 
approximates the form of the adult, as in the case of the develop- 
ment of the lobster, the crawfish, and of Palemon adspersus and 
Eriphia spinifrons (the three latter observed by Rathke). The 
eyes were developed on very short peduncles, being almost ses 
sile. The embryo was near the time of hatching, though the 
yolk was not entirely absorbed. The two pairs of antenne were 
well developed and hung down behind the large claws ; the five 
pairs of legs were well developed, the joints distinct, and the first 
pair were about twice as thick as the others, the claws rather 
large, but not so disproportionately so as in the adult form, but 
as much so as in the larva in the second stage of the lobster, fig- 
ured by Professor Smith. The eyes were large, but nearly sessile. 
The abdomen was broad and flat, spatulate at the end much as 19 
the adult ; there were five pairs of abdominal feet or swimmerets 
(Fig. 1Z), each with an endopodite and exopodite, like those 
seen in the second larval stage of the lobster. 
‘Tt was not until the greater part of this article was written that I saw that Mr. 
Faxon has raised Gelasimus pugnax from the egg for the express purpose of 
ining the embryonic cuticle, and that he has figured the forked tail of the first 204 
on his second plate, figure 11, which closely resembles that of the first stage of t : 
zoéa of Carcinus. Had I noticed that he had studied the development of Gelast 
mus, I should not have attempted to write out my notes, but conclude to offer oe 
remarks in this article subject to future corrections. Mr. Faxon does not renee 
whether Gelasimus undergoes the sub-zoéal stage of Carcinus or not, and which ont 
= : : nd 
responds in a degree to the fleshy-hatched larva of the grasshoppers, myriapods ‘ 
other Tracheata before the amnion is exuviated. 
