37° 



Stat. 37. March 30/31. Sailus ketjil, Paternoster-islands. Depth 27 m. and less. Coral and 



coralsand. 1 egg-bearing female of small size and 2 still younger specimens. 

 Stat. 53. April 21/22. Bay of Nangamessi, Sumba. Depth up to 36 m. Coralsand, near the 



shore mud. 1 young male and 1 egg-bearing female of the same size. 

 Stat. 60. April 27/28. Haingsisi, Samau Island, Timor. Reef. 1 adult male. 

 Stat. 61. May 1/2. Lamakera, Solor-island. Reef. 1 egg-bearing female of small size. 

 Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. Reef. 1 adult 



male and 1 adult female without eggs. 

 Stat. 115. July 9/1 1. East side of Pajunga Island, Kwandang-bay. Reef. 2 adult males. 

 Stat. 131. July 24/25. Anchorage off Beo, Karakelang-islands. Reef. 1 young specimen. 

 Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. 3 young males and 3 young 



females, collected on the reef, except one that was captured at a depth of 36 m., 



where the bottom was mud and hard sand. 

 Stat. 209. September 23. Anchorage off the south point of Kabaëna-island. Reef. 1 male 



and 1 egg-bearing female, both of medium size. 

 Stat. 213. October. Pulu Pasi Tanette. Reef. 19 specimens, adult males, egg-bearing females 



and younger specimens; some of these specimens are contained in yellow brown 



felted tubes formed by Oscillariae. 

 Stat. 220. November 1/3. Anchorage off Pasir Pandjang, West coast of Binongka. Reef. 1 male 



of medium size and [ younger specimen contained in a tube. 

 Stat. 240. November 22 till December 1. Banda-anchorage. Black sand, coral and Lithothamnion- 



bank in 18 — 36 m. 5 young specimens. 

 Stat. 250. December 6/7. Kur— island. 27 m. Coral and Lithothamnion. 1 young specimen. 

 Stat. 261. December 16/18. Elat, West coast of Great Kei-island. Reef. 1 adult, egg-bearing female. 

 Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- 



point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 4 young specimens. 

 Stat. 285. January 18. 8° 39'.! S., I27°4'.4E. Anchorage South coast of Timor. 34 m. On the 



limit between mud and coral. Lithothamnion. 1 very young specimen. 

 Stat. 301. January 30 — February 1. io°3S'S., I23°25'.2E. Pepela-bay, East coast of Rotti- 



island. Reef. 2 young males. 

 Stat. 313. February 14/16. Anchorage East of Dangar Besar, Saleh-bay. Reef. 1 young specimen, 



in an Oscillaria-tube. 



The fact, already contended by Dr. Ortmann in 1894 tnat A. latifrons A. M.-Edw. 

 should be identical with A. frontalis H. M.-Edw., was verified by Coutière in 1900 (Buil. 

 Muséum Paris, N° 8, p. 414) and also in 1905 in his important work on the Alpheidae of the 

 Maldive and Laccadive Archipelagoes. The remarkable manner of life of this species in felted 

 tubes formed by Oscillariae, first observed by Richters in 1880, when he described his Betacus 

 utricola, which is identical with this species, afterwards, 1. c. 1888, by myself on specimens 

 from Amboina, is also shown by the specimens that were collected by the "Siboga" at Pulu 

 Pasi Tanette near the island of Saleyer and at Stat. 220 and 313. The tubes are 20 — 30 

 centim. long. It is quite remarkable that they were not observed by Coutière. 



The form of the front, of the anterior margin of the carapace, is rather variable in this 

 species. In the adult male from Haingsisi, which is 38 mm. long, the front extends as far 

 forward as the basal joint of the outer antennae; it is arcuate, slightly emarginate in the middle 

 and laterally near the outer angles. In an adult, egg-bearing female from Stat. 2 1 3 the front 

 is a little more prominent, not emarginate in the middle and the lateral emarginations are less 

 conspicuous than usually; the lateral walls run, from the front to the orbits, more obliquely than 

 in the male from Haingsisi. In the adult, egg-bearing female from the Kei Islands, which is 



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