REPORT OF THE ECHINOIDEA—MORTENSEN 103 
Station 5165, Sulu Archipelago (lat. 4°58’20’’ N., long. 119°50’30”’ 
E.) ; 16 meters; February 24, 1908. One specimen in good condition. 
Remarks.—These specimens are quite typical representatives of this 
well-marked species, which is known only from the Sulu Archipelago. 
Genus LAGANUM Gray 
LAGANUM LAGANUM (Leske) 
Laganum bonani L. Acassiz, Monographie des scutelles, p. 108, pl. 22, figs. 25-29; 
pl. 28, figs. 8-12, 1841.—A. AcAssiz, Revision of the Hchini, p. 517, pl. 18e, 
figs. 6, 7, 1873.—KoEHLER, Echinoderma of the Indian Museum, Echinoidea, 
pt. 2, p. 83, pl. 9, fig. 4; pl. 14, fig. 6, 1922. 
Laganum laganum H. L. Crark, Hawaiian and other Pacific Echini, Clypeastri- 
dae... Scutellidae, p. 45, pl. 124, fig. 17, 1914. 
Localities —Port Argo; January 31,1908. Three dead tests. 
Bubuan Island, Jol6; February 14,1908. One dead test. 
Tatadn, Simaluc Islands, shore; February 19, 1908. Several fine 
specimens. 
Station 5166, Observation Island, Tawi Tawi Group; 97 fathoms; 
February 24, 1908. One dead test. 
Sitanki Island; February 26,1908. One dead test. 
Romblon, shore; March 26,1908. Several specimens. 
Reef opposite Cebu; April 4, 1908. One specimen. 
Catbalogan, Samar; April 15,1908. One specimen. 
Busin Harbor, Burias Island ; April 23,1908. One specimen. 
Capunuypugan, Mindanao; May 9,1908. One specimen. 
Malcochin Harbor, Linapacan Island; December 19, 1908. One 
specimen. 
Ulugan Bay, Palawan Island; December 28, 1908. One specimen. 
Remarks. —There can be no doubt that the dead specimen from sta- 
tion 5166 at 97 fathoms has not been living there, as this species is 
preeminently a littoral form. Although de Meijere, in his Siboga 
KEchinoidea, records a specimen from a depth of 34 meters (station 
299), he does not say whether it was a living specimen or a dead test; 
there is then no proof of the occurrence of this species outside the 
strictly littoral zone. 
The specimens from Catbalogan and Malcochin Harbor are un- 
usually broad, as broad as long (36 and 23 mm. long, respectively), 
but otherwise seem to be the typical form. I must regard them as 
only individual variations. 
LAGANUM DECAGONALE (de Blainville) 
Laganum decagonum L. Agassiz, Monographie des scutelles, p. 112, pl. 23, figs. 
16-20, 1841. 
Laganum (Peronella) decagonale DE Mrtsrerr, Siboga Echinoidea, p. 117, pl. 6, 
figs, 58-62, 65; pl. 18, figs. 318-324, 1904. 
