270 
joint of the antennae, and the extraordinarily enlarged size of the 
middle facets of the inner margin of the eyes, might indicate it to he 
the opposite sex of the preceding. The second segment of the abdo¬ 
men is furnished on each side with a small fascicle of elongated black 
hairs. 
This species is introduced by Mr. F. Walker into his ‘ List of the 
Dipterous Insects in the Collection of the British Museum’ (part iii. 
p. 680), under the name of Stylogaster stylatus ; but it appears to 
me that it neither accords with Macquart’s generic characters of Sty¬ 
logaster, nor with the concise Fabrician specific description of Conops 
stylata (Syst. Anti. 177), nor yet with Wiedemann’s more detailed 
observations, especially with reference to the sexual difference in the 
form of the antennae (Auss. Eur. Zw. Ins. ii. 245). 
DESCRIPTION OF THE FIGURES. 
(Annulosa, PI. X1N.) 
Fig. 1. Glossina morsitans, magnified. 1 a, the head seen in front with the hau- 
stellum removed; 1 b, the head seen sideways, the tips of the parts of the 
haustellum removed; lc, the lower part of the head, with the parts of the 
haustellum separated and the hirsute palpi removed ; Id, the underside 
of the extremity of the head and the bulb seen beneath, showing the 
bulbous base of the haustellum ; le, antenna greatly magnified, showing 
the villose anterior edge of the arista and the hirsute hairs with which 
it is furnished ; 1/, the terminal joint of the tarsus, showing the strong 
ungues and the large setose pulvilli. 
Fig. 2. Glossina tachinoides magnified. 
Fig. 3. Glossina tabaniformis magnified. 
Fig. 4. Stylomyia leonum magnified. 4a, the head and haustellum seen sideways ; 
4 b, antenna; 4 c, abdomen seen sideways ; 4 d and 4e, extremity of the 
abdomen with its appendages; 4f, hind leg; 4 g, ungues and pulvilli. 
3. On the Marine Mollusca discovered during the 
Voyages of the Herald and Pandora, by Capt. 
Kellett, B.N., and Lieut. Wood, ll.N. By Professor 
Edward Forbes, F.B.S. etc. 
(Mollusca, PI. IX. & XL) 
Out of 307 species of shells collected by the voyagers, 217 are ma¬ 
rine Gasteropoda, 1 is a Cephalopod, and 58 marine bivalves. The 
genera of which species are most numerous are —Mur ex, Purpura, 
Trochus, Terebra, Strombus, Courts, Columbella, Littorina, Oliva, 
Cyprcea, Natica, Patella, Chiton, Venus, and Area . Among the 
more local genera represented in this collection are, Monoceros, 
Pseudoliva, Cyrtulus, Saxidomus, and Crassatella. The specimens 
are usually in very fine preservation. Many of the species are rare or 
local. 
The localities at which they were chiefly collected were the coast of 
southern California, from San Diego to Magdalena, and the shores of 
Mazatlan. Unfortunately the precise locality of many of the individual 
specimens had not been noted at the time, and a quantity of Poly¬ 
nesian shells, mingled with them, have tended to render the value of 
