218 
Dichelaspis lowei, Darwin (PI. III. fig. 5). 
Dichelaspis lowei, Darwin, Mon. Cirr. Lepad., p. 128, pi. ii, fig. 8 (1851). 
Dichelaspis darwinii, Filippi, Arch. p. la Zool., i (1861). 
Dichelaspis sinuata and trigona, C. W. Aurivillius, “Stud. ii. Cirr.”, Abh. 
k. Schwed. Akad. Wiss., 1894, pp. 17 and 19, pi. ii, figs. 8, 4, 5 and 8. 
Dichelaspis darwinii , Gruvel, Nouv. Arch. de Mus. (Paris) (iv), iv, p. 275, 
pi. xiv, fig. 14 (1902). 
Dichelaspis vaillantii, Gruvel, op. cit., p. 279, pi. xiv, figs. 5—18. 
Dichelaspis sinuata, Annandale, Mem. Ind. Mus., ii, p. 121. 
The specimens in the Copenhagen collection and those in the 
Indian Museum exhibit a complete transition between the forms 
in the above synonymy, which might probably be still further 
extended by the examination of specimens from Japan and America. 
I have dealt with the question of variation in this species in my 
account of the Indian Lepadidae in the paper cited above. Probably 
D. lowei occurs in all warm and temperate seas, but as it inhabits 
the gill-chambers of Decapod Crustacea, is as a rule minute and, 
moreover, exhibits a very wide range of variation, it has escaped 
notice in many localities and when discovered has been described 
under many names. 
The Copenhagen collection includes specimens labelled as follows: 
1. On gilis of Palinurus japonicus ; Oahu. 
2. On gilis of Palinurus (? Panulirus) , Mauritius, 1862 ( D . 
apicalis , Steenstrup, MS.). 
3. On Lupea ; Posselt. (D. darwinii, Fil., Steenstrup, MS.). 
4. On Lupea ; ?Madeira (Steenstrup). 
The specimens in set No. 4 (PI. III. fig. 5) have apparently been 
prepared with osmic acid and show very clearly the outlines of 
the typical five valves of the Lepadidae with their lines of growth. 
Explanation of Plate III. 
Fig. 1, 2. Type specimens of Scalpellum valvulifer, sp. nov., X 5. 
— 3. Type specimen of S. sinense , sp. nov., X 3. 
— 4. Specimen of S. scorpio, Aurivillius, x 1: m == male. 
— 5. Capitulum of Dichelaspis lowei, Darwin, stained with (?) osmic 
acid, X 15. 
1.-12.—1910. 
