14 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
to my ^first stage,” and “B” to my ‘‘fourth stage” in Naushonia; 
“C” probably represents the last of the preadolescent stages, i. e., 
is equivalent to my “fifth stage.” Claus figures two early “stages” 
(“Lange von 34 mm.,” and “aelteres Stadium”), which differ in 
size alone, and which correspond in the development of the append¬ 
ages to my “first stage” and to Cano’s “A.” He also records two 
later stages (“Larven von 44 mm. Lange,” “ Larven von 74 min. 
Lange ”) which are equivalent respectively to my “ second ” and 
“third” stages, but have no counterpart in Cano’s series unless one 
of them corresponds to his “fase intermediaria tra A e B ” of which 
no description is given. Claus makes no record of any stage equi¬ 
valent to Cano’s “B” and to my “fourth stage.” In a later article 
(’85) he figures part of a “mysis,” corresponding to my “fifth 
stao'e” and to Cano’s “C.” The series would then stand: — 
Naushonia 
(Claus) 
(Cano) 
I = 
3.5 mm. + “aelteres” 
= “A” 
II =' 
4.5 mm. 
“fase intermediaria tra 
ii il 
1—( Y* 
1—1 
7.5 mm. 
• 
A e B.” 
= “B” 
“fase intermediaria tra 
B e C.” 
y = 
CC • 11 
“ mysis 
_ « Q » 
If Cano is correct in his statement that there is a stage between 
“ B ” and “ C,” his and Claus’ accounts can only be reconciled by 
supposing that the zoea-mysis period of Calliaxis comprises six 
stages. 
Another Crustacean larva which somewhat resembles the young 
of Calliaxis, and hence those of Naushonia, has been recorded from 
the coast of England (Brook, ’88), but unfortunately the descrip¬ 
tion of this form is too imperfect for us to determine whether the 
similarities are more than superficial. Five stages were observed 
and it is stated that the “pereiopods never pass through a schizopod 
stage.” The parent of this larva is not known. 
Outside of the young of Calliaxis, however, and possibly also of 
this “ trachelifer,” no other Decapod larvae have been described 
that even remotely resemble those of Naushonia in form or structure, 
