214 PERCY. SLADEN TRUST EXPEDITION. 
13. Pseudosquilla oculata (Brullé), 18386. 
Miers, Ann. Mag. Nat. Hist. (5) v. p. 110, pl. 3. tigs. 3, 4. 
This species differs from P. ornata in having four keels on each side of the middle 
keel instead of three. 
Specimens from Coetivy and Salomon, Chagos. 
14. ? Pseudosquilla monodactyla, A. M.-Edw., 1878. 
Miers, Ann. Mag. Nat. Hist. (5) v. p. 110, pl. 3. figs. 1, 2 (1880). 
The single specimen, which is from Zanzibar, agrees with Miers’s description, but 
(1) the rostrum is shorter and broader than in his figure, and its sides more arched; 
(2) besides the spines on the telson-edge mentioned by Miers, there is a small spine just 
behind the root of each of the outer two large spines on each side. 
Genus LYSIOSQUILLA, Dana, 1852. 
15. Lysiosquilla maculata (Fabr.), 1793. 
Squilla maculata, Fabricius, Ent. Syst. iii. i. p. 511 (1793). 
Lysiosquilla maculata, Miers, Ann. Mag. Nat. Hist. (5) v. p. 5, pl. 1. figs. 1, 2 (1880). 
One specimen from Peros Banhos, Chagos. 
The collection also contains the following larval forms :— 
1. Odonterichthus tenuicornis, Jurich, 1904. 
Jurich, ‘ Valdivia’ Stomatopoda, p. 396, pl. 28. fig. 4 (1904). 
Locality *. bb, 0-140 fathoms. 
2. Erichthus (? Odonterichthus) rostratus, n. nom. 
Erichthus sp., Claus, Abh. k. Ges. Wiss. Gott. 1871, p. 30, pl. 5. fig. 19. 
Locality. dd, surface. 
3. Pseuderichthus communis, Hansen, 1895. (Larva of Pseudosquilla ciliata.) 
Hansen, Isopoda, &c., of the Plankton Exped. p. 86, pl. 8. fig. 5 (1895); Jurich, ‘ Valdivia’ 
Stomatopoda, p. 395, pl. 29. fig. 1 (1904). 
Some specimens which measure about 11 mm. to the end of the rostrum have the 
small tooth outside the submedian tooth of the telson-edge situated midway between 
the submedian and the intermediate teeth, not nearer the latter as in later stages. 
The rostrum also is larger, as in the form which I suspect to be the young form 
of P. distinguendus. 
Localities. O, 0-180 fathoms; e, 50 fathoms; y, surface; dd, surface. 
* The letters indicating localities refer to Mr. Stanley Gardiner’s list of the Plankton collections in an earlier 
part of this same series, pp. 169-174. 
