298 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
abdomen presents on each side two linear impressions close and 
parallel to the lateral margins, which are confluent posteriorly. 
A trace of such an impressed line is found on the fourth seg- 
ment, but the five anterior postabdominal segments have their 
upper surfaces perfectly smooth. ‘The postero-lateral angles of 
the three anterior postabdominal segments are rounded and 
obtuse, but those of the fourth and fifth segments terminate 
in an acute spinule. The sixth segment is armed, as usual, 
with six, longitudinal, very acute spines ; those which constitute 
the postero-lateral angles are the longest, extending most back- 
wards. The distance between the two submedian spines is 
less than that of the next spine from each of them, and even 
a little less than the distance between the two lateral spines. 
The terminal segment is transverse, being much broader than 
long and about as long as the preceding segment. In its arma- 
ture this segment much resembles that of the other species of 
the genus Pseudosquilla and appears even to be similar to Pseu- 
dosquilla Lessonii. The posterior margin is armed with six 
acute spines, of which the two submedian are mobile and well 
developed ; they are placed close to one another, and no teeth 
are observed between them. Between the submedian spines 
and the first lateral ones I observe two small truncate teeth, 
and a similar small truncate tooth occurs between the first and 
the second lateral spines. 
The upper surface of the segment presents a compressed, ele- 
vated, longitudinal, median keel, terminating posteriorly in an 
acute spine; on each side of the median keel five longitudinal 
carine are observed (the keeled lateral margin being included), 
of which the first and the third, however, are interrupted, the 
others being continuous. The first, situated next to the median 
keel, consists, more properly, of a longitudinal row of three 
acute spines (that of the left side presenting only two spines) ; 
the second lateral carina is continuous, but terminates posteriorly 
in two small acute spinules, placed one behind the other. The 
third lateral keel is again interrupted in the middle, the pos- 
terior portion terminating in an acute spinule; the fourth 
lateral keel is continuous, and proceeds upon the external lateral 
spine of the posterior margin even to its pot. The under 
surface of the terminal segment is armed with four acute spines, 
two on each side, corresponding with the interstices between 
the spines of the posterior margin. 
