ELMINIUS 2SS 



St. 53. 12.V. 26. Port Stanley, East Falkland Island, on the hulk of the 'Great Britain'. 0-2 m. 

 Gear RM. One medium sized specimen on a Mytihis shell. 



St. 55. 16. V. 26. Port Stanley, East Falkland Island. 10-16 m. Gear BTS. Several young speci- 

 mens on Mollusc shells. 



St. 56. 16. V. 26. Sparrow Cove, Port William, East Falkland Island. io|-i6 m. Gear BTS. 

 Several young and old specimens on small shells of Molluscs with hermit crabs. 



St. 57. 16. V. 26. Port William, East Falkland Island. 15 m. Gear BTS. Several large, mosdy 

 empty, shells. 



St. 222. 23.iv. 27. St Martin's Cove, Hermite Island, Cape Horn. 30-35 m. Gear NRL. Three 

 large specimens. 



St. WS95. 17.iv.27. 48° 58' 15" S, 64° 45' 00" W. i09m.,f.d.s.st.sh. Gear DC. Several small 

 dead shells on a mussel shell. 



Distribution. California, Chile, Peru, Tierra del Fuego, Magellan Strait, Falkland 

 Islands, Sandwich Islands, Chinca Islands. From the tidal zone down to 275 m. 

 (Nilsson-Cantell, 1921). The species is found on stones, shells, tubes, and according 

 to Darwin also on Balanus psittacus (Molina, 1892), Darwin, 1854. 



This well-known species is represented by several specimens. They are all quite 

 typical. To the discussion by Nilsson-Cantell, 1921, nothing need be added here. It is 

 of interest to note that some very small specimens were taken from St. 55. The smallest 

 measures in carino-rostral diameter 1-5 mm.; all have six well developed compartments 

 in the wall. Therefore it is not possible to make certain whether a stage with four valves 

 exists here. The localities noted here are not new, as the species is well-known from the 

 Falkland Islands and Cape Horn. 



Genus Elminius, Leach, 1825 

 Elminius kingi. Gray, 183 1. 



For synonymy see Nilsson-Cantell, 1921, Zool. Bidrag Uppsala, vii, p. 348. 



St. 53. 12. V. 26. Port Stanley, East Falkland Island, on the hulk of the 'Great Britain'. 0-2 m. 

 Gear RM. One large and two smaller specimens on a Mytihis shell. 



Distribution. Tierra del Fuego, Patagonia, Chile. On rocks, shells and floating 

 timber in tidal water. 



Supplementary Description. This species has already been fully described by Darwin 

 (1854) and Nilsson-Cantell (1921). The Discovery specimens are of a conical shape. 



Shell white, without ribs, and in the larger individuals covered by a brown cuticle. 



Opercular valves quite typical, and the internal parts are as described by Nilsson- 

 Cantell (192 1 ). The penis has a dorsal point at the base not previously mentioned for 

 this genus. Darwin mentions this process for many species oi Bala>ius (see also Nilsson- 

 Cantell, 1 921). 



Measurements: the carino-rostral diameter of the large specimen is 14mm., its 

 height II mm. The carino-rostral diameter of one of the smaller specimens is 6 mm., 

 its height 2 mm. 



